@article{SF_1974__6_133989,
     author = {M. Satyanarayana},
     title = {On left canellative semigroups.},
     journal = {Semigroup forum},
     pages = {317--329},
     year = {1974},
     volume = {6},
     zbl = {0267.20058},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133989/}
}