@article{GDZPPN002306557, title = {On L-Semi-Groups.}, journal = {Mathematische Annalen}, volume = {196}, year = {1972}, pages = {13-22}, language = {en}, url = {http://dml.mathdoc.fr/item/GDZPPN002306557} }
Zassenhaus, Hans J. On L-Semi-Groups.. Mathematische Annalen, Tome 196 (1972) pp. 13-22. http://gdmltest.u-ga.fr/item/GDZPPN002306557/