, . . English summaries. Butlletí de la Societat Catalana de Matemàtiques, [S. l.], v. 35, n. 1, p. 81–82, 2020. Disponível em: https://revistes.iec.cat/index.php/BSCM/article/view/107699.003. Acesso em: 9 may. 2024.