@article{SF_1977__14_186375,
     author = {J.C. Spehner},
     title = {Presentations et presentations simplifiables d'un monoide simplifiable.},
     journal = {Semigroup forum},
     pages = {295--330},
     publisher = {mathdoc},
     volume = {14},
     year = {1977},
     zbl = {0477.20037},
     url = {http://geodesic.mathdoc.fr/item/SF_1977__14_186375/}
}