MARTÍNEZ-ABEJÓN, A.; PELLO, J. Finite representability of the Yang operator. Annales Fennici Mathematici, [S. l.], v. 28, n. 1, p. 169–180, 2003. Disponível em: https://afm.journal.fi/article/view/135071. Acesso em: 17 may. 2024.