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\(P_{NI}\)-equations. (English. Russian original) Zbl 0185.42403
U.S.S.R. Comput. Math. Math. Phys. 7(1967), No. 4, 127-142 (1969); translation from Zh. Vychisl. Mat. Mat. Fiz. 7, 813-824 (1967).
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