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@article{DAN_1958_119_6_a11, author = {K. A. Mikhailova}, title = {The entrance problem for direct unions of groups}, journal = {Doklady Akademii Nauk}, pages = {1103--1105}, publisher = {mathdoc}, volume = {119}, number = {6}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1958_119_6_a11/} }
K. A. Mikhailova. The entrance problem for direct unions of groups. Doklady Akademii Nauk, Tome 119 (1958) no. 6, pp. 1103-1105. http://geodesic.mathdoc.fr/item/DAN_1958_119_6_a11/