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@article{MZM_1986_40_1_a0, author = {R. G. Alizade}, title = {Characteristic classes (purities) of short exact sequences in the category of {Abelian} groups}, journal = {Matemati\v{c}eskie zametki}, pages = {3--15}, publisher = {mathdoc}, volume = {40}, number = {1}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1986_40_1_a0/} }
R. G. Alizade. Characteristic classes (purities) of short exact sequences in the category of Abelian groups. Matematičeskie zametki, Tome 40 (1986) no. 1, pp. 3-15. http://geodesic.mathdoc.fr/item/MZM_1986_40_1_a0/