@article{GDZPPN001253336, title = {Une topolgie du monoide libre.}, journal = {Semigroup forum}, volume = {18}, year = {1979}, pages = {33-50}, zbl = {0444.68076}, url = {http://dml.mathdoc.fr/item/GDZPPN001253336} }
Reutenauer, C. Une topolgie du monoide libre.. Semigroup forum, Tome 18 (1979) pp. 33-50. http://gdmltest.u-ga.fr/item/GDZPPN001253336/