@article{ARM_1983__19_2_a5,
     author = {\v{S}marda, Bohumil and Niemenmaa, Markku},
     title = {Normal subgroups as ideals},
     journal = {Archivum mathematicum},
     pages = {109--111},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1983},
     mrnumber = {724303},
     zbl = {0554.20005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1983__19_2_a5/}
}