@article{SF_1979__18_134340,
     author = {C. Reutenauer},
     title = {Une topolgie du monoide libre.},
     journal = {Semigroup forum},
     pages = {33--50},
     year = {1979},
     volume = {18},
     zbl = {0444.68076},
     url = {http://geodesic.mathdoc.fr/item/SF_1979__18_134340/}
}