@article{GDZPPN002401851, title = {An Extension of Group Theory to S-semigroups.}, journal = {Mathematische Zeitschrift}, volume = {105}, year = {1968}, pages = {74-90}, zbl = {0155.04702}, url = {http://dml.mathdoc.fr/item/GDZPPN002401851} }
Tamaschke, Olaf. An Extension of Group Theory to S-semigroups.. Mathematische Zeitschrift, Tome 105 (1968) pp. 74-90. http://gdmltest.u-ga.fr/item/GDZPPN002401851/