MARCELLI, L., and G. PANNOCCHIA. “I Tempi Di Tragitto Delle P„ Per I Terremoti Della Sicilia Occidentale”. Annals of Geophysics 25, no. 4 (November 25, 1972): 527–550. Accessed May 23, 2022. https://www.annalsofgeophysics.eu/index.php/annals/article/view/5120.