@article{SD_1967-1968__21_2_A8_0,
     author = {Petresco, Julian},
     title = {Pr\'egroupes de mots et probl\`eme des mots},
     journal = {S\'eminaire Dubreil. Alg\`ebre et th\'eorie des nombres},
     note = {talk:17},
     pages = {1--11},
     publisher = {Secr\'etariat math\'ematique},
     volume = {21},
     number = {2},
     year = {1967-1968},
     mrnumber = {254128},
     zbl = {0208.03201},
     language = {fr},
     url = {http://archive.numdam.org/item/SD_1967-1968__21_2_A8_0/}
}