@article{ITA_1979__13_4_363_0,
     author = {Autebert, J. M. and Beauquier, J. and Boasson, L. and Nivat, M.},
     title = {Quelques probl\`emes ouverts en th\'eorie des langages alg\'ebriques},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {363--378},
     publisher = {EDP-Sciences},
     volume = {13},
     number = {4},
     year = {1979},
     mrnumber = {556958},
     zbl = {0434.68056},
     language = {fr},
     url = {http://archive.numdam.org/item/ITA_1979__13_4_363_0/}
}