@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},
     year = {1968},
     volume = {18},
     number = {1},
     mrnumber = {0242978},
     zbl = {0174.04402},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1968_18_1_a5/}
}