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Found 3 Documents (Results 1–3)

Ukr. Math. J. 42, No. 8, 1001-1006 (1990); translation from Ukr. Mat. Zh. 42, No. 8, 1122-1128 (1990).
MSC:  35L70 22E05
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Ukr. Math. J. 42, No. 9, 1100-1106 (1990); translation from Ukr. Mat. Zh. 42, No. 9, 1237-1244 (1990).
MSC:  35L70 22E05 35C05
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