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@article{MS_1963__102_2_a2, author = {{\CYRA}.{\CYRH}. {\CYRL}{\cyri}{\cyrv}{\cyrsh}{\cyri}{\cyrc}}, title = {{\CYRS}{\cyru}{\cyrm}{\cyrm}{\cyri}{\cyrr}{\cyro}{\cyrv}{\cyra}{\cyrn}{\cyri}{\cyre} {\cyro}{\cyrt}{\cyro}{\cyrb}{\cyrr}{\cyra}{\cyrzh}{\cyre}{\cyrn}{\cyri}{\cyrishrt} {\cyri} {\cyrp}{\cyro}{\cyrn}{\cyrya}{\cyrt}{\cyri}{\cyre} {\cyrc}{\cyre}{\cyrn}{\cyrt}{\cyrr}{\cyra} {\cyrv} {\cyrk}{\cyra}{\cyrt}{\cyre}{\cyrg}{\cyro}{\cyrr}{\cyri}{\cyrya}{\cyrh}}, journal = {Matemati\v{c}eskij sbornik}, pages = {159--184}, publisher = {mathdoc}, volume = {102}, number = {2}, year = {1963}, zbl = {0202.32202}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1963__102_2_a2/} }
А.Х. Лившиц. Суммирование отображений и понятие центра в категориях. Matematičeskij sbornik, Tome 102 (1963) no. 2, pp. 159-184. http://geodesic.mathdoc.fr/item/MS_1963__102_2_a2/