Dányi, Gábor. “On Domain and Range Tree Languages of Superlinear Deterministic Top-down Tree Transformations”. Acta Cybernetica 12, no. 3 (January 1, 1996): 261–277. Accessed April 16, 2025. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3461.