L. Gregori, “Geomorfologia e neotettonica dell’area di Colfiorito (Umbria): Geomorphology and neotectonics of Colfiorito area (Umbria, Italy)”, Geog. Fis. Dinam. Quat., vol. 13, no. 1, pp. 43–52, Jun. 1990, Accessed: Apr. 16, 2026. [Online]. Available: https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/800