MORASSI, A. Introduzion ai problemis inviers dai autovalˆors in une dimension. Gjornâl Furlan des Siencis - Friulian Journal of Science, Udine, Italy, v. 31, n. 31, p. 47–64, 2021. Disponível em: https://www.gfs-fjs.net/index.php/gsf/article/view/292. Acesso em: 2 may. 2025.