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ORCIDJack H. Koolen
Jacobus H. Koolen
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2020 – today
- 2025
[j130]Jack H. Koolen, Chenhui Lv, Jongyook Park, Qianqian Yang:
Bounding the intersection number c2 of a distance-regular graph with classical parameters (D,b,α,β) in terms of b. Discret. Math. 348(2): 114239 (2025)- [j129]Alexander L. Gavrilyuk, Jack H. Koolen
:
A characterization of the Grassmann graphs. J. Comb. Theory B 171: 1-27 (2025) - 2024
- [j128]Jack H. Koolen, Jae-Ho Lee, Shuang-Dong Li, Yun-Han Li, Xiaoye Liang, Ying-Ying Tan:
On the (Non-)Existence of Tight Distance-Regular Graphs: a Local Approach. Electron. J. Comb. 31(2) (2024) - [j127]Mamoon Abdullah, Brhane Gebremichel, Sakander Hayat, Jack H. Koolen:
Distance-regular graphs with a few q-distance eigenvalues. Discret. Math. 347(5): 113926 (2024) - 2023
- [j126]Zheng-Jiang Xia, Jae-Ho Lee, Jack H. Koolen:
A New Feasibility Condition for the AT4 Family. Electron. J. Comb. 30(2) (2023) - [j125]Ying-Ying Tan, Jack H. Koolen, Mengyue Cao, Jongyook Park:
Correction to: Thin Q-Polynomial Distance-Regular Graphs Have Bounded c2. Graphs Comb. 39(1): 12 (2023) - [j124]Aida Abiad, Wouter Castryck, Maarten De Boeck, Jack H. Koolen, Sjanne Zeijlemaker:
An infinite class of Neumaier graphs and non-existence results. J. Comb. Theory A 193: 105684 (2023) - 2022
- [j123]Jack H. Koolen, Brhane Gebremichel:
There Does Not Exist a Strongly Regular Graph with Parameters $(1911, 270, 105, 27)$. Electron. J. Comb. 29(2) (2022) - [j122]Aida Abiad, Bart De Bruyn, Jozefien D'haeseleer, Jack H. Koolen:
Neumaier graphs with few eigenvalues. Des. Codes Cryptogr. 90(9): 2003-2019 (2022) - [j121]Yuanjiang Zhang, Xiaoye Liang, Jack H. Koolen:
The 2-partially distance-regular graphs such that their second largest local eigenvalues are at most one. Discret. Math. 345(3): 112749 (2022) - [j120]Jack H. Koolen, Jae-Ho Lee, Ying-Ying Tan:
Remarks on pseudo-vertex-transitive graphs with small diameter. Discret. Math. 345(10): 112990 (2022) - [j119]Sebastian M. Cioaba, Jack H. Koolen, Masato Mimura, Hiroshi Nozaki, Takayuki Okuda:
On the spectrum and linear programming bound for hypergraphs. Eur. J. Comb. 104: 103535 (2022) - [j118]Ying-Ying Tan, Jack H. Koolen, Mengyue Cao, Jongyook Park:
Thin Q-Polynomial Distance-Regular Graphs Have Bounded c2. Graphs Comb. 38(6): 175 (2022) - [j117]Mengyue Cao, Jack H. Koolen, Yen-Chi Roger Lin, Wei-Hsuan Yu:
The Lemmens-Seidel conjecture and forbidden subgraphs. J. Comb. Theory A 185: 105538 (2022) - 2021
- [j116]Ying-Ying Tan, Xiaoye Liang, Jack H. Koolen:
Thin Distance-Regular Graphs with Classical Parameters $(D, q, q, \frac{q^{t}-1}{q-1}-1)$ with $t> D$ are the Grassmann Graphs. Electron. J. Comb. 28(4) (2021) - [j115]Brhane Gebremichel, Mengyue Cao, Jack H. Koolen:
Two characterizations of the grid graphs. Discret. Math. 344(11): 112550 (2021) - [j114]Gary R. W. Greaves, Jack H. Koolen, Jongyook Park:
Augmenting the Delsarte bound: A forbidden interval for the order of maximal cliques in strongly regular graphs. Eur. J. Comb. 97: 103384 (2021) - [j113]Noga Alon, Sebastian M. Cioaba, Brandon D. Gilbert, Jack H. Koolen, Brendan D. McKay:
Addressing Johnson Graphs, Complete Multipartite Graphs, Odd Cycles, and Random Graphs. Exp. Math. 30(3): 372-382 (2021) - [j112]Jack H. Koolen, Mengyue Cao, Qianqian Yang:
Recent Progress on Graphs with Fixed Smallest Adjacency Eigenvalue: A Survey. Graphs Comb. 37(4): 1139-1178 (2021) - [j111]Jack H. Koolen, Akihiro Munemasa, Atsuhiro Nakamoto, Katsuhiro Ota, Akira Saito:
Preface to the special issue dedicated to Professors Eiichi Bannai and Hikoe Enomoto on their 75th birthdays. Graphs Comb. 37(5): 1465-1466 (2021) - [j110]Mengyue Cao, Jack H. Koolen, Akihiro Munemasa, Kiyoto Yoshino:
Maximality of Seidel matrices and switching roots of graphs. Graphs Comb. 37(5): 1491-1507 (2021) - [j109]Sebastian M. Cioaba, Jack H. Koolen, Paul M. Terwilliger:
Connectivity concerning the last two subconstituents of a Q-polynomial distance-regular graph. J. Comb. Theory A 177: 105325 (2021) - 2020
- [j108]Jack H. Koolen, Ying-Ying Tan, Zheng-Jiang Xia:
A spectral characterization of the s-clique extension of the triangular graphs. Discuss. Math. Graph Theory 40(2): 663-676 (2020) - [j107]Ivan Guo, Jack H. Koolen, Greg Markowsky, Jongyook Park:
On the nonexistence of pseudo-generalized quadrangles. Eur. J. Comb. 89: 103128 (2020) - [j106]Zhi Qiao, Jack H. Koolen, Greg Markowsky:
On the Cheeger constant for distance-regular graphs. J. Comb. Theory A 173: 105227 (2020) - [i10]Sebastian M. Cioaba, Jack H. Koolen, Masato Mimura, Hiroshi Nozaki, Takayuki Okuda:
On the spectrum and linear programming bound for hypergraphs. CoRR abs/2009.03022 (2020)
2010 – 2019
- 2019
- [j105]Alexander L. Gavrilyuk, Jack H. Koolen:
A Characterization of the Graphs of Bilinear (d×d)-Forms over F2. Comb. 39(2): 289-32 (2019) - [j104]Zhi Qiao, Yifan Jing, Jack H. Koolen:
Non-Bipartite Distance-Regular Graphs with a Small Smallest Eigenvalue. Electron. J. Comb. 26(2): 2 (2019) - [j103]Katharina T. Huber, Jack H. Koolen, Vincent Moulton:
The polytopal structure of the tight-span of a totally split-decomposable metric. Discret. Math. 342(3): 868-878 (2019) - [j102]Gary R. W. Greaves, Jack H. Koolen:
Another construction of edge-regular graphs with regular cliques. Discret. Math. 342(10): 2818-2820 (2019) - [j101]Sakander Hayat, Jack H. Koolen, Muhammad Riaz:
A spectral characterization of the s-clique extension of the square grid graphs. Eur. J. Comb. 76: 104-116 (2019) - [j100]Sejeong Bang, Alexander L. Gavrilyuk, Jack H. Koolen:
Distance-regular graphs without 4-claws. Eur. J. Comb. 80: 120-142 (2019) - [j99]Zhi Qiao, Jongyook Park, Jack H. Koolen:
On 2-walk-regular graphs with a large intersection number c2. Eur. J. Comb. 80: 224-235 (2019) - [j98]Jack H. Koolen, Masood Ur Rehman, Qianqian Yang:
On the Integrability of Strongly Regular Graphs. Graphs Comb. 35(6): 1273-1291 (2019) - [j97]Jack H. Koolen, Quaid Iqbal, Jongyook Park, Masood Ur Rehman:
There Does Not Exist a Distance-Regular Graph with Intersection Array {80, 54, 12; 1, 6, 60}. Graphs Comb. 35(6): 1597-1608 (2019) - [j96]Jack H. Koolen, Qianqian Yang, Jae Young Yang:
A generalization of a theorem of Hoffman. J. Comb. Theory B 135: 75-95 (2019) - [j95]Zhi Qiao, Jacobus H. Koolen:
A new characterization of the dual polar graphs. J. Comb. Theory B 135: 200-211 (2019) - [i9]Francesco Belardo, Sebastian M. Cioaba, Jack H. Koolen, Jianfeng Wang:
Open problems in the spectral theory of signed graphs. CoRR abs/1907.04349 (2019) - 2018
- [j94]Francesco Belardo, Sebastian M. Cioaba, Jack H. Koolen, Jianfeng Wang:
Open problems in the spectral theory of signed graphs. Art Discret. Appl. Math. 1(2): #P2.10 (2018) - [j93]Gary R. W. Greaves, Jack H. Koolen:
Edge-regular graphs with regular cliques. Eur. J. Comb. 71: 194-201 (2018) - [j92]Xi-Ming Cheng, Gary R. W. Greaves, Jack H. Koolen:
Graphs with three eigenvalues and second largest eigenvalue at most 1. J. Comb. Theory B 129: 55-78 (2018) - [j91]Edwin R. van Dam, Jack H. Koolen, Jongyook Park:
Partially metric association schemes with a multiplicity three. J. Comb. Theory B 130: 19-48 (2018) - [j90]Zhi Qiao, Jacobus H. Koolen:
A valency bound for distance-regular graphs. J. Comb. Theory A 155: 304-320 (2018) - [i8]Sebastian M. Cioaba, Jack H. Koolen, Hiroshi Nozaki:
A spectral version of the Moore problem for bipartite regular graphs. CoRR abs/1805.01056 (2018) - [i7]Sebastian M. Cioaba, Brandon D. Gilbert, Jack H. Koolen, Brendan D. McKay:
Addressing Johnson graphs, complete multipartite graphs, odd cycles and other graphs. CoRR abs/1808.04757 (2018) - 2017
- [j89]Qianqian Yang, Aida Abiad, Jack H. Koolen:
An Application of Hoffman Graphs for Spectral Characterizations of Graphs. Electron. J. Comb. 24(1): 1 (2017) - [j88]Aart Blokhuis, Edwin R. van Dam, Willem H. Haemers, Jack H. Koolen:
Preface to the special issue dedicated to Andries E. Brouwer. Des. Codes Cryptogr. 84(1-2): 1-2 (2017) - [j87]Jack H. Koolen, Zhi Qiao:
Light tails and the Hermitian dual polar graphs. Des. Codes Cryptogr. 84(1-2): 3-12 (2017) - [j86]Xi-Ming Cheng, Jack H. Koolen:
A generalization of a theorem of Neumaier. Des. Codes Cryptogr. 84(1-2): 135-142 (2017) - [j85]Sebastian M. Cioaba, Jacobus H. Koolen, Weiqiang Li:
Max-cut and extendability of matchings in distance-regular graphs. Eur. J. Comb. 62: 232-244 (2017) - 2016
- [j84]Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton, Andreas Spillner:
Characterizing block graphs in terms of their vertex-induced partitions. Australas. J Comb. 66: 1-9 (2016) - [j83]Zhi Qiao, Shao-Fei Du, Jack H. Koolen:
2-Walk-Regular Dihedrants from Group-Divisible Designs. Electron. J. Comb. 23(2): 2 (2016) - [j82]Jack H. Koolen, Greg Markowsky:
A collection of results concerning electric resistance and simple random walk on distance-regular graphs. Discret. Math. 339(2): 737-744 (2016) - [j81]Jacobus H. Koolen, Woo-Sun Lee, William J. Martin, Hajime Tanaka:
Arithmetic completely regular codes. Discret. Math. Theor. Comput. Sci. 17(3): 59-76 (2016) - [j80]Xi-Ming Cheng, Alexander L. Gavrilyuk, Gary R. W. Greaves, Jack H. Koolen:
Biregular graphs with three eigenvalues. Eur. J. Comb. 56: 57-80 (2016) - [j79]Gary R. W. Greaves, Jacobus H. Koolen, Akihiro Munemasa, Ferenc Szöllösi:
Equiangular lines in Euclidean spaces. J. Comb. Theory A 138: 208-235 (2016) - [j78]Sebastian M. Cioaba, Jack H. Koolen, Hiroshi Nozaki, Jason R. Vermette:
Maximizing the Order of a Regular Graph of Given Valency and Second Eigenvalue. SIAM J. Discret. Math. 30(3): 1509-1525 (2016) - 2015
- [j77]Sven Herrmann, Jack H. Koolen, Alice Lesser, Vincent Moulton, Taoyang Wu:
Optimal realizations of two-dimensional, totally-decomposable metrics. Discret. Math. 338(8): 1289-1299 (2015) - [j76]Sejeong Bang, Jack H. Koolen, Jongyook Park:
Some Results on the Eigenvalues of Distance-Regular Graphs. Graphs Comb. 31(6): 1841-1853 (2015) - [j75]Gary R. W. Greaves, Jack H. Koolen, Akihiro Munemasa, Yoshio Sano, Tetsuji Taniguchi:
Edge-signed graphs with smallest eigenvalue greater than -2. J. Comb. Theory B 110: 90-111 (2015) - [i6]Sebastian M. Cioaba, Jack H. Koolen, Hiroshi Nozaki, Jason R. Vermette:
Large regular graphs with given valency and second eigenvalue. CoRR abs/1503.06286 (2015) - [i5]Sebastian M. Cioaba, Jack H. Koolen, Weiqiang Li:
Max-cut and extendability of matchings in distance-regular graphs. CoRR abs/1507.06254 (2015) - 2014
- [j74]Hye Jin Jang, Jack H. Koolen, Akihiro Munemasa, Tetsuji Taniguchi:
On fat Hoffman graphs with smallest eigenvalue at least -3. Ars Math. Contemp. 7(1): 105-121 (2014) - [j73]Sejeong Bang, Jacobus H. Koolen:
On geometric distance-regular graphs with diameter three. Eur. J. Comb. 36: 331-341 (2014) - [j72]Sebastian M. Cioaba, Jack H. Koolen, Weiqiang Li:
Disconnecting strongly regular graphs. Eur. J. Comb. 38: 1-11 (2014) - [j71]Edwin R. van Dam, Willem H. Haemers, Jack H. Koolen:
Regular graphs with maximal energy per vertex. J. Comb. Theory B 107: 123-131 (2014) - 2013
- [j70]Jack H. Koolen, Joohyung Kim, Jongyook Park:
Distance-Regular Graphs with a Relatively Small Eigenvalue Multiplicity. Electron. J. Comb. 20(1): 1 (2013) - [j69]Jack H. Koolen, Greg Markowsky, Jongyook Park:
On electric resistances for distance-regular graphs. Eur. J. Comb. 34(4): 770-786 (2013) - [j68]Jack H. Koolen, Jongyook Park:
A note on distance-regular graphs with a small number of vertices compared to the valency. Eur. J. Comb. 34(6): 935-940 (2013) - [j67]Jongyook Park, Jack H. Koolen, Greg Markowsky:
There are only finitely many distance-regular graphs with valency k at least three, fixed ratio k2/k and large diameter. J. Comb. Theory B 103(6): 733-741 (2013) - [i4]Sebastian M. Cioaba, Jack H. Koolen, Weiqiang Li:
Disconnecting strongly regular graphs. CoRR abs/1311.5634 (2013) - 2012
- [b1]Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton, Andreas Spillner:
Basic Phylogenetic Combinatorics. Cambridge University Press 2012, ISBN 978-0-521-76832-0, pp. I-XII, 1-264 - [j66]Jack H. Koolen, Jongyook Park:
A relationship between the diameter and the intersection number c 2 for a distance-regular graph. Des. Codes Cryptogr. 65(1-2): 55-63 (2012) - [j65]Jack H. Koolen, Alice Lesser, Vincent Moulton, Taoyang Wu:
Injective optimal realizations of finite metric spaces. Discret. Math. 312(10): 1602-1610 (2012) - [j64]Jack H. Koolen, Jongyook Park:
Distance-regular graphs with a2 or c2 at least half the valency. J. Comb. Theory A 119(3): 546-555 (2012) - [j63]Sebastian M. Cioaba, Kijung Kim, Jack H. Koolen:
On a conjecture of Brouwer involving the connectivity of strongly regular graphs. J. Comb. Theory A 119(4): 904-922 (2012) - 2011
- [j62]Aleksandar Jurisic, Jack H. Koolen:
Classification of the family AT4(qs, q, q) of antipodal tight graphs. J. Comb. Theory A 118(3): 842-852 (2011) - [j61]Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton:
Blocks and Cut Vertices of the Buneman Graph. SIAM J. Discret. Math. 25(4): 1902-1919 (2011) - [i3]Sebastian M. Cioaba, Kijung Kim, Jack H. Koolen:
On a conjecture of Brouwer regarding the connectivity of strongly regular graphs. CoRR abs/1105.0796 (2011) - 2010
- [j60]Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton, Andreas Spillner:
An Algorithm for Computing Cutpoints in Finite Metric Spaces. J. Classif. 27(2): 158-172 (2010) - [j59]Saieed Akbari, Ebrahim Ghorbani, Jacobus H. Koolen, Mohammad Reza Oboudi:
On Sum of Powers of the Laplacian and Signless Laplacian Eigenvalues of Graphs. Electron. J. Comb. 17(1) (2010) - [j58]Greg Markowsky, Jacobus H. Koolen:
A Conjecture of Biggs Concerning the Resistance of a Distance-Regular Graph. Electron. J. Comb. 17(1) (2010) - [j57]Sebastian M. Cioaba, Edwin R. van Dam, Jack H. Koolen, Jae-Ho Lee:
A lower bound for the spectral radius of graphs with fixed diameter. Eur. J. Comb. 31(6): 1560-1566 (2010) - [j56]Jack H. Koolen, Jongyook Park:
Shilla distance-regular graphs. Eur. J. Comb. 31(8): 2064-2073 (2010) - [j55]Sejeong Bang, Akira Hiraki, Jack H. Koolen:
Delsarte Set Graphs with Small c2. Graphs Comb. 26(2): 147-162 (2010) - [j54]Jacobus H. Koolen, Sejeong Bang:
On distance-regular graphs with smallest eigenvalue at least -m. J. Comb. Theory B 100(6): 573-584 (2010)
2000 – 2009
- 2009
- [j53]Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton:
A graph-theoretical invariant of topological spaces. Appl. Math. Lett. 22(2): 159-162 (2009) - [j52]Stefan Grünewald, Jacobus H. Koolen, Woo-Sun Lee:
Quartets in maximal weakly compatible split systems. Appl. Math. Lett. 22(10): 1604-1608 (2009) - [j51]Ebrahim Ghorbani, Jack H. Koolen, Jae Young Yang:
Bounds for the Hückel Energy of a Graph. Electron. J. Comb. 16(1) (2009) - [j50]Sejeong Bang, Tatsuya Fujisaki, Jack H. Koolen:
The spectra of the local graphs of the twisted Grassmann graphs. Eur. J. Comb. 30(3): 638-654 (2009) - [j49]Andries E. Brouwer, Jack H. Koolen:
The vertex-connectivity of a distance-regular graph. Eur. J. Comb. 30(3): 668-673 (2009) - [j48]Jack H. Koolen, Alice Lesser, Vincent Moulton:
Optimal realizations of generic five-point metrics. Eur. J. Comb. 30(5): 1164-1171 (2009) - [i2]Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton, Andreas Spillner:
An algorithm for computing cutpoints in finite metric spaces. CoRR abs/0910.2317 (2009) - [i1]Jacobus H. Koolen, Woo-Sun Lee, William J. Martin:
Arithmetic completely regular codes. CoRR abs/0911.1826 (2009) - 2008
- [j47]Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton:
Cut points in metric spaces. Appl. Math. Lett. 21(6): 545-548 (2008) - [j46]Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton:
Block realizations of finite metrics and the tight-span construction I: The embedding theorem. Appl. Math. Lett. 21(12): 1306-1309 (2008) - [j45]Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton, Andreas Spillner:
Characterizing Cell-Decomposable Metrics. Electron. J. Comb. 15(1) (2008) - [j44]Sejeong Bang, Hyun Kwang Kim, Jack H. Koolen, Mitsugu Hirasaka, Sung Yell Song:
Preface. Discret. Math. 308(14): 2925 (2008) - [j43]Aleksandar Jurisic, Jack H. Koolen, Arjana Zitnik:
Triangle-free distance-regular graphs with an eigenvalue multiplicity equal to their valency and diameter 3. Eur. J. Comb. 29(1): 193-207 (2008) - [j42]Y. B. Choe, Katharina T. Huber, Jacobus H. Koolen, Y. S. Kwon, Vincent Moulton:
Counting vertices and cubes in median graphs of circular split systems. Eur. J. Comb. 29(2): 443-456 (2008) - [j41]Kris Coolsaet, Aleksandar Jurisic, Jack H. Koolen:
On triangle-free distance-regular graphs with an eigenvalue multiplicity equal to the valency. Eur. J. Comb. 29(5): 1186-1199 (2008) - [j40]Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton:
Compatible decompositions and block realizations of finite metrics. Eur. J. Comb. 29(7): 1617-1633 (2008) - 2007
- [j39]Jack H. Koolen, Alice Lesser, Vincent Moulton:
Concerning the Relationship between Realizations and Tight Spans of Finite Metrics. Discret. Comput. Geom. 38(3): 605-614 (2007) - [j38]Sejeong Bang, Akira Hiraki, Jacobus H. Koolen:
Delsarte clique graphs. Eur. J. Comb. 28(2): 501-516 (2007) - [j37]Sejeong Bang, Jacobus H. Koolen, Vincent Moulton:
Two theorems concerning the Bannai-Ito conjecture. Eur. J. Comb. 28(7): 2026-2052 (2007) - [c1]Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton:
An Algorithm for Computing Virtual Cut Points in Finite Metric Spaces. COCOA 2007: 4-10 - 2006
- [j36]Sejeong Bang, Akira Hiraki, Jacobus H. Koolen:
Improving diameter bounds for distance-regular graphs. Eur. J. Comb. 27(1): 79-89 (2006) - [j35]Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton:
On the structure of the tight-span of a totally split-decomposable metric. Eur. J. Comb. 27(3): 461-479 (2006) - [j34]Hans-Jürgen Bandelt, Victor Chepoi, Andreas W. M. Dress, Jack H. Koolen:
Combinatorics of lopsided sets. Eur. J. Comb. 27(5): 669-689 (2006) - [j33]Edwin R. van Dam, Willem H. Haemers, Jacobus H. Koolen, Edward Spence:
Characterizing distance-regularity of graphs by the spectrum. J. Comb. Theory A 113(8): 1805-1820 (2006) - 2005
- [j32]Andreas W. M. Dress, Barbara R. Holland, Katharina T. Huber, Jack H. Koolen, Vincent Moulton, Jan Weyer-Menkhoff:
Delta additive and Delta ultra-additive maps, Gromov's trees, and the Farris transform. Discret. Appl. Math. 146(1): 51-73 (2005) - [j31]Sejeong Bang, Jack H. Koolen:
Some Interlacing Results for the Eigenvalues of Distance-regular graphs. Des. Codes Cryptogr. 34(2-3): 173-186 (2005) - [j30]Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton:
The tight span of an antipodal metric space - Part I: : Combinatorial properties. Discret. Math. 303(1-3): 65-79 (2005) - [j29]Aleksandar Jurisic, Jack H. Koolen, Stefko Miklavic:
Triangle- and pentagon-free distance-regular graphs with an eigenvalue multiplicity equal to the valency. J. Comb. Theory B 94(2): 245-258 (2005) - [j28]Akira Hiraki, Jack H. Koolen:
A generalization of an inequality of Brouwer-Wilbrink. J. Comb. Theory A 109(1): 181-188 (2005) - 2004
- [j27]Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton:
The Tight Span of an Antipodal Metric Space: Part II--Geometrical Properties. Discret. Comput. Geom. 31(4): 567-586 (2004) - [j26]Jack H. Koolen, Vincent Moulton, Dragan Stevanovic:
The structure of spherical graphs. Eur. J. Comb. 25(2): 299-310 (2004) - [j25]Akira Hiraki, Jack H. Koolen:
A Note on Regular Near Polygons. Graphs Comb. 20(4): 485-497 (2004) - 2003
- [j24]Andries E. Brouwer, Jack H. Koolen, Mikhail H. Klin:
A Root Graph that is Locally the Line Graph of the Peterson Graph. Discret. Math. 264(1-3): 13-24 (2003) - [j23]Andreas W. M. Dress, Jack H. Koolen, Vincent Moulton:
Addendum to "on line arrangements in the hyperbolic plane" [European J. Combin.23 (2002) 549-557]. Eur. J. Comb. 24(3): 347 (2003) - [j22]Sejeong Bang, Jack H. Koolen, Vincent Moulton:
A bound for the number of columns l(c, a, b) in the intersection array of a distance-regular graph. Eur. J. Comb. 24(7): 785-795 (2003) - [j21]Jack H. Koolen, Vincent Moulton:
Maximal Energy Bipartite Graphs. Graphs Comb. 19(1): 131-135 (2003) - [j20]Andries E. Brouwer, Chris D. Godsil, Jack H. Koolen, William J. Martin:
Width and dual width of subsets in polynomial association schemes. J. Comb. Theory A 102(2): 255-271 (2003) - 2002
- [j19]Aleksandar Jurisic, Jacobus H. Koolen:
Krein parameters and antipodal tight graphs with diameter 3 and 4. Discret. Math. 244(1-3): 181-202 (2002) - [j18]Andreas W. M. Dress, Jack H. Koolen, Vincent Moulton:
On Line Arrangements in the Hyperbolic Plane. Eur. J. Comb. 23(5): 549-557 (2002) - [j17]Jack H. Koolen, Vincent Moulton:
Hyperbolic Bridged Graphs. Eur. J. Comb. 23(6): 683-699 (2002) - [j16]Jack H. Koolen, Vincent Moulton:
On a Conjecture of Bannai and Ito: There are Finitely Many Distance-regular Graphs with Degree 5, 6 or 7. Eur. J. Comb. 23(8): 987-1006 (2002) - 2001
- [j15]Jack H. Koolen, Vincent Moulton:
Maximal Energy Graphs. Adv. Appl. Math. 26(1): 47-52 (2001) - [j14]Andreas W. M. Dress, Katharina T. Huber, Jacobus H. Koolen, Vincent Moulton:
Six Points Suffice: How to Check for Metric Consistency. Eur. J. Comb. 22(4): 465-474 (2001) - 2000
- [j13]Aleksandar Jurisic, Jack H. Koolen:
A Local Approach to 1-Homogeneous Graphs. Des. Codes Cryptogr. 21(1/3): 127-147 (2000) - [j12]Jack H. Koolen, Monique Laurent, Alexander Schrijver:
Equilateral Dimension of the Rectilinear Space. Des. Codes Cryptogr. 21(1/3): 149-164 (2000) - [j11]Jack H. Koolen, Vincent Moulton, Udo Tönges:
A Classification of the Six-point Prime Metrics. Eur. J. Comb. 21(6): 815-829 (2000) - [j10]Aleksandar Jurisic, Jack H. Koolen:
Nonexistence of some Antipodal Distance-regular Graphs of Diameter Four. Eur. J. Comb. 21(8): 1039-1046 (2000)
1990 – 1999
- 1999
- [j9]Sandi Klavzar, Jack H. Koolen, Henry Martyn Mulder:
Graphs which Locally Mirror the Hypercube Structure. Inf. Process. Lett. 71(2): 87-90 (1999) - 1998
- [j8]Jack H. Koolen:
The Distance-regular Graphs with Intersection Number a1!=0 and with an Eigenvalue -1-(b1/2). Comb. 18(2): 227-234 (1998) - [j7]Jack H. Koolen, Vincent Moulton, Udo Tönges:
The coherency index. Discret. Math. 192(1-3): 205-222 (1998) - 1995
- [j6]Jacobus H. Koolen:
A Characterization of the Doob Graphs. J. Comb. Theory B 65(1): 125-138 (1995) - 1994
- [j5]Jack H. Koolen, Sergey V. Shpectorov:
Distance-regular Graphs the Distance Matrix of which has Only One Positive Eigenvalue. Eur. J. Comb. 15(3): 269-275 (1994) - 1993
- [j4]Andries E. Brouwer, Jacobus H. Koolen:
A new infinite series of regular uniformly geodetic code graphs. Discret. Math. 120(1-3): 241-247 (1993) - [j3]Jacobus H. Koolen:
On uniformly geodetic graphs. Graphs Comb. 9(2-4): 325-333 (1993) - 1992
- [j2]Jack H. Koolen:
A new condition for distance-regular graphs. Eur. J. Comb. 13(1): 63-64 (1992) - 1990
- [j1]J. M. van den Akker, Jacobus H. Koolen, Rob J. M. Vaessens:
Perfect modes with distinct protective radii. Discret. Math. 81(1): 103-109 (1990)
Coauthor Index
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