@article{SF_1984__28_134660,
     author = {J. Doyen},
     title = {Equipotence et unicit\'e de systems g\'en\'erateurs minimaux dans certains monoides.},
     journal = {Semigroup forum},
     pages = {341--346},
     publisher = {mathdoc},
     volume = {28},
     year = {1984},
     zbl = {0524.20033},
     url = {http://geodesic.mathdoc.fr/item/SF_1984__28_134660/}
}