Federici, Paolo Roberto. “PROCEEDINGS OF THE MEETING MORPHOTECTONICS IN ITALY: Abbadia Di Fiastra (Tolentino), 8-9 January 1988”. Geografia Fisica E Dinamica Quaternaria, vol. 1, Jan. 1988, p. 5, https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/1108.