Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1980__16_4_a8, author = {Vor\'a\v{c}, Franti\v{s}ek}, title = {Subgroups and normal subgroups as systems of ideals}, journal = {Archivum mathematicum}, pages = {239--244}, publisher = {mathdoc}, volume = {16}, number = {4}, year = {1980}, mrnumber = {0594472}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1980__16_4_a8/} }
Voráč, František. Subgroups and normal subgroups as systems of ideals. Archivum mathematicum, Tome 16 (1980) no. 4, pp. 239-244. http://geodesic.mathdoc.fr/item/ARM_1980__16_4_a8/