@article{GDZPPN002400936, title = {Properties of Groups Related to the Second Center.}, journal = {Mathematische Zeitschrift}, volume = {99}, year = {1967}, pages = {356-368}, zbl = {0149.27204}, url = {http://dml.mathdoc.fr/item/GDZPPN002400936} }
Kappe, Wolfgang P. Properties of Groups Related to the Second Center.. Mathematische Zeitschrift, Tome 99 (1967) pp. 356-368. http://gdmltest.u-ga.fr/item/GDZPPN002400936/