This article is cited in 1 paper

Mathematical Events in the USSR and abroad

Andrei Nikolaevich Tikhonov (on his sixtieth birthday)

P. S. Aleksandrov, V. A. Il'in


MSC: 01A70, 54E45, 46A11, 35K05, 35K50, 45B05

 English version: Russian Mathematical Surveys, 1967, 22:2, 109–110

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