Geodesic
On the homotopy and homology realization of exact sequences of groups
Sbornik. Mathematics, Tome 25 (1975) no. 1, pp. 77-86 Cet article a éte moissonné depuis la source Math-Net.Ru

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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/

[1] S. Maklein, Gomologiya, izd-vo «Mir», Moskva, 1966

[2] Khu Sy-Tszyan, Teoriya gomotopii, izd-vo «Mir>, Moskva, 1964