@article{ITA_1977__11_3_207_0,
     author = {Ruohonen, K.},
     title = {A note on equal powers of word morphisms},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {207--211},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {11},
     number = {3},
     year = {1977},
     mrnumber = {498918},
     zbl = {0374.20064},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1977__11_3_207_0/}
}