, . . English summaries. Butlletí de la Societat Catalana de Matemàtiques, [S. l.], v. 36, n. 1, p. 115–116, 2021. Disponível em: https://revistes.iec.cat/index.php/BSCM/article/view/110751.003. Acesso em: 20 may. 2024.