Geodesic
Crossed modules, Crossed n-fold extension of groups and Cohomology theory in Abstract Categories
Δελτίο της Ελληνικής Μαθηματικής Εταιρίας , Tome 41 (1999), p. 3-27.

Voir la notice de l'article provenant de la source Hellenic Digital Mathematics Library

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     author = {George Danas},
     title = {Crossed modules, {Crossed} n-fold extension of groups and {Cohomology} theory in {Abstract} {Categories}},
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},
     pages = {3-27},
     publisher = {mathdoc},
     volume = {41},
     year = {1999},
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     url = {http://geodesic.mathdoc.fr/item/DEME_1999__41_a0/}
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George Danas. Crossed modules, Crossed n-fold extension of groups and Cohomology theory in Abstract Categories. Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
, Tome 41 (1999), p. 3-27. http://geodesic.mathdoc.fr/item/DEME_1999__41_a0/