L. A. Lusternik, V. A. Ditkin, “Preface”, Travaux Inst. Math. Stekloff, 1947, Volume 20,Page 5

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Travaux Inst. Math. Stekloff, 1947 Volume 20, Page 5 (Mi tm915)

Preface

L. A. Lusternik, V. A. Ditkin

© Steklov Math. Inst. of RAS, 2026