LAVECCHIA, G., and G. PIALLI. “Modello Geodinamico dell’Area Umbro-Marchigiana E Suo Significato Sismogenetico”. Annals of Geophysics 34, no. 1 (November 25, 1981): 135–147. Accessed August 4, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4690.