FIRRAO, G. Premesse. Gjornâl Furlan des Siencis - Friulian Journal of Science, Udine, Italy, v. 13, n. 13, p. 15–16, 2010. Disponível em: https://www.gfs-fjs.net/index.php/gsf/article/view/132. Acesso em: 2 may. 2025.