Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1968__18_1_a5, author = {\v{S}ulka, Robert}, title = {Note on the {\v{S}evrin} radical in semigroups}, journal = {Mathematica slovaca}, pages = {57--58}, publisher = {mathdoc}, volume = {18}, number = {1}, year = {1968}, mrnumber = {0242978}, zbl = {0174.04402}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1968__18_1_a5/} }
Šulka, Robert. Note on the Ševrin radical in semigroups. Mathematica slovaca, Tome 18 (1968) no. 1, pp. 57-58. http://geodesic.mathdoc.fr/item/MASLO_1968__18_1_a5/