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@article{MZ_1967__101_170851, author = {Wolfgang P. Kappe}, title = {Properties of {Groups} {Related} to the {Second} {Center.}}, journal = {Mathematische Zeitschrift}, pages = {356--368}, publisher = {mathdoc}, volume = {101}, year = {1967}, zbl = {0149.27204}, url = {http://geodesic.mathdoc.fr/item/MZ_1967__101_170851/} }
Wolfgang P. Kappe. Properties of Groups Related to the Second Center.. Mathematische Zeitschrift, Tome 101 (1967), pp. 356-368. http://geodesic.mathdoc.fr/item/MZ_1967__101_170851/