@article{SF_1972__4_133901,
     author = {C.F. Kelemen},
     title = {Actions by a bisimple w-semigroup.},
     journal = {Semigroup forum},
     pages = {248--251},
     publisher = {mathdoc},
     volume = {4},
     year = {1972},
     zbl = {0256.22003},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133901/}
}