Brozzetti, F., and F. Stoppa , trans. “Le Piroclastiti Medio-Pleistoceniche Di Massa Martana- Acquasparta (Umbria): Caratteri Strutturali E Vulcanologici”. Alpine and Mediterranean Quaternary 8, no. 1 (February 24, 1995): 95–110. Accessed November 23, 2024. https://amq.aiqua.it/index.php/amq/article/view/1018.