@article{GDZPPN002389320, title = {The tensor product and the 2nd nilpotent product of groups.}, journal = {Mathematische Zeitschrift}, volume = {73}, year = {1960}, pages = {134-145}, zbl = {0121.27002}, url = {http://dml.mathdoc.fr/item/GDZPPN002389320} }
MacHenry, Trueman. The tensor product and the 2nd nilpotent product of groups.. Mathematische Zeitschrift, Tome 73 (1960) pp. 134-145. http://gdmltest.u-ga.fr/item/GDZPPN002389320/