@article{SF_1978__16_134277,
     author = {H.J. Weinert},
     title = {On left, right and two-sided cancellable elements of semigroups.},
     journal = {Semigroup forum},
     pages = {97--104},
     publisher = {mathdoc},
     volume = {16},
     year = {1978},
     zbl = {0387.20055},
     url = {http://geodesic.mathdoc.fr/item/SF_1978__16_134277/}
}