@article{SF_1971__3_133857,
     author = {M.L. Dubreil-Jacotin},
     title = {Sur les o-bandes.},
     journal = {Semigroup forum},
     pages = {156--159},
     publisher = {mathdoc},
     volume = {3},
     year = {1971},
     zbl = {0237.06013},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__3_133857/}
}