@article{700824,
     title = {Topological representation of semigroups},
     booktitle = {General Topology and its Relations to Modern Analysis and Algebra},
     series = {GDML\_Books},
     publisher = {Academia Publishing House of the Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1967},
     pages = {276-282},
     mrnumber = {MR0246281},
     zbl = {0184.25901},
     url = {http://dml.mathdoc.fr/item/700824}
}

Paalman - de Miranda, A. B. Topological representation of semigroups, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1967), pp. 276-282. http://gdmltest.u-ga.fr/item/700824/