Fülöp, Zoltán. “Decomposition Results Concerning K-Visit Attributed Tree Transducers”. Acta Cybernetica 6, no. 2 (January 1, 1983): 163-171. Accessed November 30, 2022. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3249.