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Editor's preface

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Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova Akademii Nauk SSSR, Vol. 21, pp. 3–4, 1971.

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Ladyzhenskaya, O.A. Editor's preface. J Math Sci 1, 391–392 (1973).

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