L. È. Èl'sgol'ts, “The variation of the topological structure of level surfaces”, Mat. Sb. (N.S.), 1948, Volume 23(65), Number 3,Pages <nobr>399

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JOURNALS // Matematicheskii Sbornik // Archive

Mat. Sb. (N.S.), 1948 Volume 23(65), Number 3, Pages 399–418 (Mi sm6269)

The variation of the topological structure of level surfaces

L. È. Èl'sgol'ts

Received: 20.03.1947

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