Biagi, P. F., L. Castellana, T. Maggipinto, and A. Ermini. “An Overview on Preseismic Anomalies in LF Radio Signals Revealed in Italy by Wavelet Analysis”. Annals of Geophysics 51, no. 1 (February 13, 2008): 237–246. Accessed April 26, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4445.