ALESSANDRINI, B. “On the Possibility of Determining the Focal Parameters of an Earthquake Using a Local Network Equipped With Three-Component Seismometers”. Annals of Geophysics 34, no. 1 (November 25, 1981): 189–207. Accessed April 26, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4695.