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@article{JRAM_1981__325_152362, author = {P. Ribenboim}, title = {Active sums of groups.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {153--182}, publisher = {mathdoc}, volume = {325}, year = {1981}, zbl = {0451.20028}, url = {http://geodesic.mathdoc.fr/item/JRAM_1981__325_152362/} }
P. Ribenboim. Active sums of groups.. Journal für die reine und angewandte Mathematik, Tome 325 (1981), pp. 153-182. http://geodesic.mathdoc.fr/item/JRAM_1981__325_152362/