@article{SF_1995__50_3_135373,
     author = {K.H. Hofmann},
     title = {From a topological theory of semigroup to a geometric one.},
     journal = {Semigroup forum},
     pages = {123--134},
     publisher = {mathdoc},
     volume = {50},
     number = {3},
     year = {1995},
     zbl = {0824.22008},
     url = {http://geodesic.mathdoc.fr/item/SF_1995__50_3_135373/}
}