Decidability of periodicity for infinite words
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) no. 1, pp. 43-46. 
@article{ITA_1986__20_1_43_0,
     author = {Pansiot, Jean-Jacques},
     title = {Decidability of periodicity for infinite words},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {43--46},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {20},
     number = {1},
     year = {1986},
     mrnumber = {849964},
     zbl = {0617.68063},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1986__20_1_43_0/}
}
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AU  - Pansiot, Jean-Jacques
TI  - Decidability of periodicity for infinite words
JO  - RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
PY  - 1986
SP  - 43
EP  - 46
VL  - 20
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PB  - AFCET - Gauthier-Villars
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Pansiot, Jean-Jacques. Decidability of periodicity for infinite words. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) no. 1, pp. 43-46. http://www.numdam.org/item/ITA_1986__20_1_43_0/

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