SERTORIO, L. De energjie fossile ae energjie solâr. Gjornâl Furlan des Siencis - Friulian Journal of Science, Udine, Italy, v. 9, n. 9, p. 9–53, 2008. Disponível em: https://www.gfs-fjs.net/index.php/gsf/article/view/99. Acesso em: 2 may. 2025.