@article{GDZPPN002395568, title = {The multiplicative groups of a ring.}, journal = {Mathematische Zeitschrift}, volume = {87}, year = {1965}, pages = {378-384}, zbl = {0138.26803}, url = {http://dml.mathdoc.fr/item/GDZPPN002395568} }
Farahat, H.K. The multiplicative groups of a ring.. Mathematische Zeitschrift, Tome 87 (1965) pp. 378-384. http://gdmltest.u-ga.fr/item/GDZPPN002395568/