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Theor. Math. Phys. 58, 131-140 (1984); translation from Teor. Mat. Fiz. 58, No. 2, 200-212 (1984).
MSC:  35Q99 35G20 35A30
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Theor. Math. Phys. 58, 16-24 (1984); translation from Teor. Mat. Fiz. 58, No. 1, 26-37 (1984).
Reviewer: A.Fleischer
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