STRASSOLT, M. Teorie dai numars indiçs. Gjornâl Furlan des Siencis - Friulian Journal of Science, Udine, Italy, v. 24, n. 24, p. 149–229, 2017. Disponível em: https://www.gfs-fjs.net/index.php/gsf/article/view/236. Acesso em: 2 may. 2025.