Bella, F., R. Bella, P. F. Biagi, M. Caputo, G. Della Monica, A. Ermini, W. Plastino, and V. Sgrigna. “Artificial and Natural Electromagnetic Signals Revealed During Two Years in the Amare Cave (Central Italy)”. Annals of Geophysics 37, no. 5 Sup. (November 25, 1994). Accessed April 23, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4161.