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@article{MZ_1968__104_170931, author = {Olaf Tamaschke}, title = {An {Extension} of {Group} {Theory} to {S-semigroups.}}, journal = {Mathematische Zeitschrift}, pages = {74--90}, publisher = {mathdoc}, volume = {104}, year = {1968}, zbl = {0155.04702}, url = {http://geodesic.mathdoc.fr/item/MZ_1968__104_170931/} }
Olaf Tamaschke. An Extension of Group Theory to S-semigroups.. Mathematische Zeitschrift, Tome 104 (1968), pp. 74-90. http://geodesic.mathdoc.fr/item/MZ_1968__104_170931/