@article{107080, author = {Franti\v sek Vor\'a\v c}, title = {Subgroups and normal subgroups as systems of ideals}, journal = {Archivum Mathematicum}, volume = {016}, year = {1980}, pages = {239-244}, mrnumber = {0594472}, language = {en}, url = {http://dml.mathdoc.fr/item/107080} }
Voráč, František. Subgroups and normal subgroups as systems of ideals. Archivum Mathematicum, Tome 016 (1980) pp. 239-244. http://gdmltest.u-ga.fr/item/107080/
Theory of x-ideals, Acta Math., vol. 107 (1962), 1-52. (1962) | MR 0148773 | Zbl 0108.26002