no. 2
On the decidability of the equivalence problem for monadic recursive programs
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 34 (2000) no. 2, pp. 157-171. 
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     author = {Zakharov, Vladimir A.},
     title = {On the decidability of the equivalence problem for monadic recursive programs},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {157--171},
     publisher = {EDP-Sciences},
     volume = {34},
     number = {2},
     year = {2000},
     mrnumber = {1774307},
     zbl = {0962.68091},
     language = {en},
     url = {http://www.numdam.org/item/ITA_2000__34_2_157_0/}
}
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Zakharov, Vladimir A. On the decidability of the equivalence problem for monadic recursive programs. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 34 (2000) no. 2, pp. 157-171. http://www.numdam.org/item/ITA_2000__34_2_157_0/

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