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@article{JRAM_1976__285_151755, author = {Robert W. van der Waall}, title = {On minimal subgroups which are normal.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {77--78}, publisher = {mathdoc}, volume = {285}, year = {1976}, zbl = {0326.20020}, url = {http://geodesic.mathdoc.fr/item/JRAM_1976__285_151755/} }
Robert W. van der Waall. On minimal subgroups which are normal.. Journal für die reine und angewandte Mathematik, Tome 285 (1976), pp. 77-78. http://geodesic.mathdoc.fr/item/JRAM_1976__285_151755/