@article{GDZPPN00228801X, title = {Embedding of Topological Semigroups.}, journal = {Mathematische Annalen}, volume = {137}, year = {1959}, pages = {197-203}, zbl = {0099.01803}, url = {http://dml.mathdoc.fr/item/GDZPPN00228801X} }
ROTHMAN, N.J. Embedding of Topological Semigroups.. Mathematische Annalen, Tome 137 (1959) pp. 197-203. http://gdmltest.u-ga.fr/item/GDZPPN00228801X/