Farabollini, Piero, et al. , translators. “PROPOSAL FOR PRESERVATION AND PROTECTION OF THE MARCHE REGION MUD VOLCANOES (CENTRAL ITALY) ”. Alpine and Mediterranean Quaternary, vol. 18, no. 1, May 2005, pp. 179-84, https://amq.aiqua.it/index.php/amq/article/view/485.