@article{GDZPPN001263951, title = {From a topological theory of semigroup to a geometric one.}, journal = {Semigroup forum}, volume = {51}, year = {1995}, pages = {123-134}, zbl = {0824.22008}, url = {http://dml.mathdoc.fr/item/GDZPPN001263951} }
Hofmann, K.H. From a topological theory of semigroup to a geometric one.. Semigroup forum, Tome 51 (1995) pp. 123-134. http://gdmltest.u-ga.fr/item/GDZPPN001263951/