@misc{10_4153_CMB_1974_124_7,
     title = {L{\textquoteright}arithm\'etique {Toposienne} {Des} {Mots} {Naturels}},
     journal = {Canadian mathematical bulletin},
     pages = {685--688},
     year = {1975},
     volume = {17},
     number = {5},
     doi = {10.4153/CMB-1974-124-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-124-7/}
}