Costantini, Edorardo A. C., and Rosario Napoli. “Properties and Geographic Relevance of Fragipan and Other Close-Packed Horizons in a Non-Glaciated Mediterranean Region”. Geografia Fisica e Dinamica Quaternaria 19, no. 1 (June 30, 1996): 29–45. Accessed April 6, 2025. https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/607.