no. 3
A note on equal powers of word morphisms
RAIRO. Informatique théorique, Tome 11 (1977) no. 3, pp. 207-211 
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     author = {Ruohonen, K.},
     title = {A note on equal powers of word morphisms},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {207--211},
     year = {1977},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {11},
     number = {3},
     mrnumber = {498918},
     zbl = {0374.20064},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1977__11_3_207_0/}
}
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Ruohonen, K. A note on equal powers of word morphisms. RAIRO. Informatique théorique, Tome 11 (1977) no. 3, pp. 207-211. https://www.numdam.org/item/ITA_1977__11_3_207_0/

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4. K. Ruohonen, Some combinatorial mappings of words. Annales Academiac Scientiarum Fennicae, Series A.I., Mathematicae, Dissertationes, 9, 1976. | Zbl | MR