no. 6
Two-variable word equations
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 34 (2000) no. 6, pp. 467-501. 
@article{ITA_2000__34_6_467_0,
     author = {Ilie, Lucian and Plandowski, Wojciech},
     title = {Two-variable word equations},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {467--501},
     publisher = {EDP-Sciences},
     volume = {34},
     number = {6},
     year = {2000},
     mrnumber = {1844714},
     zbl = {0977.68070},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_2000__34_6_467_0/}
}
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Ilie, Lucian; Plandowski, Wojciech. Two-variable word equations. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 34 (2000) no. 6, pp. 467-501. http://archive.numdam.org/item/ITA_2000__34_6_467_0/

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