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Found 9 Documents (Results 1–3)

J. Sov. Math. 47, No. 6, 2917-2926 (1989); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 159, 132-142 (1987).
MSC:  65N40 35K60
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