@article{BSMF_1964__92__259_0, author = {Rangaswamy, K.}, title = {On $\sum $-groups}, journal = {Bulletin de la Soci\'et\'e Math\'ematique de France}, pages = {259--262}, publisher = {Soci\'et\'e math\'ematique de France}, volume = {92}, year = {1964}, doi = {10.24033/bsmf.1610}, mrnumber = {32 #5733}, zbl = {0127.25501}, language = {en}, url = {http://www.numdam.org/articles/10.24033/bsmf.1610/} }
Rangaswamy, K. On $\sum $-groups. Bulletin de la Société Mathématique de France, Volume 92 (1964), pp. 259-262. doi : 10.24033/bsmf.1610. http://www.numdam.org/articles/10.24033/bsmf.1610/
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