@article{10_4153_CMB_1966_074_3,
     author = {Derd\'erian, J.-C. and Thierrin, G.},
     title = {Demi-Groupes {Separateurs}},
     journal = {Canadian mathematical bulletin},
     pages = {611--619},
     year = {1966},
     volume = {9},
     number = {5},
     doi = {10.4153/CMB-1966-074-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1966-074-3/}
}