Quattrocchi, F., M. Calcara, and B. Porfidia. “A Prototype Radonmeter for Seismic Surveillance”. Annals of Geophysics 40, no. 6 (November 25, 1997). Accessed April 16, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/3835.