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Normal forms of functions in neighbourhoods of degenerate critical points. (English) Zbl 0304.57018
Translation from Usp. Mat. Nauk 29, No. 2(176), 11–49 (1974; Zbl 0298.57022).

MSC:
57R70 Critical points and critical submanifolds in differential topology
58K05 Critical points of functions and mappings on manifolds
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