, . . English summaries. Butlletí de la Societat Catalana de Matemàtiques, [S. l.], v. 30, n. 2, p. 207–209, 2016. Disponível em: https://revistes.iec.cat/index.php/BSCM/article/view/89852.003. Acesso em: 18 dec. 2025.