@article{ITA_1987__21_3_245_0,
     author = {Courcelle, Bruno and Gallier, Jean H.},
     title = {Decidable subcases of the equivalence problem for recursive program schemes},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {245--286},
     publisher = {EDP-Sciences},
     volume = {21},
     number = {3},
     year = {1987},
     mrnumber = {910079},
     zbl = {0634.68017},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1987__21_3_245_0/}
}