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Math. USSR, Izv. 31, No. 2, 273-305 (1988); translation from Izv. Akad. Nauk SSSR, Ser. Mat. 51, No. 5, 962-993 (1987).
MSC:  35K50 35A05 35R25
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Math. USSR, Izv. 31, No. 2, 407-421 (1988); translation from Izv. Akad. Nauk SSSR, Ser. Mat. 51, No. 5, 1088-1103 (1987).
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Math. USSR, Izv. 31, No. 2, 349-379 (1988); translation from Izv. Akad. Nauk SSSR, Ser. Mat. 51, No. 5, 1033-1064 (1987).
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