Del Negro, C., E. Armadillo, E. Bozzo, L. Cafarella, A. Meloni, R. Napoli, and A. Zirizzotti. “Piezomagnetic Effects Induced by Artificial Sources at Mt. Vesuvius (Italy): Preliminary Results of an Experimental Survey”. Annals of Geophysics 41, no. 3 (November 25, 1998). Accessed December 8, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4344.