NAGY, Benedek. Derivation "Trees" and Parallelism in Chomsky-Type Grammars. Triangle, Tarragona, n. 8, p. 101–120, 2018. DOI: 10.17345/triangle8.101-120. Disponível em: https://revistes.urv.cat/index.php/triangle/article/view/2405.. Acesso em: 15 mar. 2025.