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@article{MS_1942__53_1-2_a0, author = {{\CYRS}.{\CYRL}. {\CYRP}{\cyro}{\cyrn}{\cyrt}{\cyrr}{\cyrya}{\cyrg}{\cyri}{\cyrn}}, title = {A method of calculation of homology groups}, journal = {Matemati\v{c}eskij sbornik}, pages = {3--14}, publisher = {mathdoc}, volume = {53}, number = {1-2}, year = {1942}, zbl = {0063.06307}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MS_1942__53_1-2_a0/} }
С.Л. Понтрягин. A method of calculation of homology groups. Matematičeskij sbornik, Tome 53 (1942) no. 1-2, pp. 3-14. http://geodesic.mathdoc.fr/item/MS_1942__53_1-2_a0/