P. Ambrosetti, C. Bartolini, and C. Bosi, “L’evoluzione geologica e morfologica quaternaria dell’area adiacente la bassa valle del Fiume Fiora (Viterbo) : Geological and morphological Quaternary evolution of the lower Fiora Valley area (Viterbo)”, Geog. Fis. Dinam. Quat., vol. 4, no. 2, pp. 104–134, Dec. 1981, Accessed: Jul. 09, 2025. [Online]. Available: https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/990