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@article{MS_1968__118_3_a9, author = {{\CYRG}.{\CYRI}. {\CYRK}{\cyra}{\cyrc}}, title = {{\CYRR}{\cyra}{\cyrs}{\cyrsh}{\cyri}{\cyrr}{\cyre}{\cyrn}{\cyri}{\cyrya} {\cyrg}{\cyrr}{\cyru}{\cyrp}{\cyrp}, {\cyrya}{\cyrv}{\cyrl}{\cyrya}{\cyryu}{\cyrshch}{\cyri}{\cyre}{\cyrs}{\cyrya} {\cyrk}{\cyro}{\cyrl}{\cyrsftsn}{\cyrc}{\cyre}{\cyrv}{\cyrery}{\cyrm}{\cyri} {\cyrg}{\cyrr}{\cyru}{\cyrp}{\cyrp}{\cyra}{\cyrm}{\cyri}}, journal = {Matemati\v{c}eskij sbornik}, pages = {473--496}, publisher = {mathdoc}, volume = {118}, number = {3}, year = {1968}, zbl = {0205.03301}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1968__118_3_a9/} }
Г.И. Кац. Расширения групп, являющиеся кольцевыми группами. Matematičeskij sbornik, Tome 118 (1968) no. 3, pp. 473-496. http://geodesic.mathdoc.fr/item/MS_1968__118_3_a9/