MENIS, S., and C. MORELLI. “CONTRIBUTO ALLO STUDIO DELLA COSIDETTA «FASE PRINCIPALE» DI UN SISMOGRAMMA”. Annals of Geophysics 2, no. 4 (November 25, 1949): 545–575. Accessed October 27, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/5985.