@article{BSMF_1980__108__285_0,
     author = {Perraud, Jean},
     title = {Sur le probl\`eme des mots des quotients de groupes et produits libres},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {285--331},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {108},
     year = {1980},
     doi = {10.24033/bsmf.1921},
     mrnumber = {82h:20043},
     zbl = {0449.20047},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1921/}
}