@article{SF_1996__52_3_135463,
     author = {M. Filali},
     title = {Right cancellation in {{\ss}S} and {UG.}},
     journal = {Semigroup forum},
     pages = {381--388},
     year = {1996},
     volume = {52},
     number = {3},
     zbl = {0871.22001},
     url = {http://geodesic.mathdoc.fr/item/SF_1996__52_3_135463/}
}