Fülöp, Zoltán, and Loránd Muzamel. “Weighted Tree-Walking Automata”. Acta Cybernetica 19, no. 2 (January 1, 2009): 275-293. Accessed April 25, 2024. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3769.