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This research was partially supported by the Air Force Office of Scientific Research under Contract AF 49 (638)-1382 and Grant AF EOAR 65-42.
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Hartman, P., Stampacchia, G. On some non-linear elliptic differential-functional equations. Acta Math. 115, 271–310 (1966). https://doi.org/10.1007/BF02392210
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DOI: https://doi.org/10.1007/BF02392210