@article{GDZPPN00238731X, title = {On a generalization of finite nilpotent groups.}, journal = {Mathematische Zeitschrift}, volume = {67}, year = {1957}, pages = {189-204}, zbl = {0079.25501}, url = {http://dml.mathdoc.fr/item/GDZPPN00238731X} }
Sah, Chih-Han. On a generalization of finite nilpotent groups.. Mathematische Zeitschrift, Tome 67 (1957) pp. 189-204. http://gdmltest.u-ga.fr/item/GDZPPN00238731X/