@article{SF_1979__18_134354,
     author = {J. Sakarovitch},
     title = {Monoides pointes.},
     journal = {Semigroup forum},
     pages = {235--264},
     publisher = {mathdoc},
     volume = {18},
     year = {1979},
     zbl = {0419.68093},
     url = {http://geodesic.mathdoc.fr/item/SF_1979__18_134354/}
}