@article{PDML_1985___2B_21_0,
     author = {Berstel, Jean},
     title = {Some {Recent} {Results} on {Squarefree} {Words}},
     journal = {Publications du D\'epartement de math\'ematiques (Lyon)},
     pages = {21--36},
     publisher = {Universit\'e Claude Bernard - Lyon 1},
     number = {2B},
     year = {1985},
     mrnumber = {848821},
     zbl = {0605.03015},
     language = {en},
     url = {http://www.numdam.org/item/PDML_1985___2B_21_0/}
}