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[1]
EHRESMANN C, 1965, CAHIERS TOP GEOM DIF, V7, P45
[2]
EHRESMANN C, 1963, ANN I FOURIER, V13, P9
[3]
EHRESMANN C, 1963, ANN I FOURIER, V13, P2
[4]
Ehresmann Ch., 1965, CATEGORIES STRUCTURE