This article is cited in 1 paper

Lazar' Aronovich Lyusternik (on his eightieth birthday)

P. S. Aleksandrov, M. I. Vishik, V. A. Ditkin, A. N. Kolmogorov, M. A. Lavrent'ev, O. A. Oleinik


MSC: 01A70

 English version: Russian Mathematical Surveys, 1980, 35:6, 1–9

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