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"The Interchange or Pump (Di)Lemmas for Context-Free Languages."
R. Boonyavatana, Giora Slutzki (1988)
- R. Boonyavatana, Giora Slutzki:
The Interchange or Pump (Di)Lemmas for Context-Free Languages. Theor. Comput. Sci. 56: 321-338 (1988)
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