scientific article; zbMATH DE number 3318625
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Publication:5598330
zbMath0201.00401MaRDI QIDQ5598330
V. V. Ryzhkov, N. M. Ostianu, A. P. Norden
Publication date: 1970
Full work available at URL: http://mathnet.ru/umn/v25/i5/p259
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