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2 - Group extensions, representations, and the Schur multiplicator
Beyl, F. Rudolf (1944-....)   /   Tappe, Jürgen (1949-....)

Cote : [LNM 958]

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4 - Universal extensions and one dimensional crystalline cohomology
Mazur, Barry (1937-....)   /   Messing, William

Cote : [18.5 MAZ 74]