Geodesic
On the homotopy and homology realization of exact sequences of groups
Sbornik. Mathematics, Tome 25 (1975) no. 1, pp. 77-86

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In this article we prove the existence of homology and homotopy realizations of exact sequences of abelian groups. For exact sequences ending in a nonabelian group, we give a sufficient condition for the existence of a realization. Bibliography: 2 titles. 
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     title = {On the homotopy and homology realization of exact sequences of groups},
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A. V. Shokurov. On the homotopy and homology realization of exact sequences of groups. Sbornik. Mathematics, Tome 25 (1975) no. 1, pp. 77-86. http://geodesic.mathdoc.fr/item/SM_1975_25_1_a4/