M. A. Akivis, “Focal maps of a surface of rank <nobr>$r$</nobr>”, Izv. Vyssh. Uchebn. Zaved. Mat., 1957, Number 1,Pages <nobr>9

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JOURNALS // Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika // Archive

Izv. Vyssh. Uchebn. Zaved. Mat., 1957 Number 1, Pages 9–19 (Mi ivm3016)

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Focal maps of a surface of rank $r$

M. A. Akivis

Received: 12.10.1957

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