PRODINGER, Helmut. Deepest nodes in marked ordered trees. Annales Mathematicae Silesianae, [S. l.], v. 36, n. 2, p. 215–227, 2022. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14553. Acesso em: 3 jul. 2025.