Silva, Hugo Gonçalves, Mourad Bezzeghoud, Maria Manuela Oliveira, António Heitor Reis, and Rui Namorado Rosa. “A Simple Statistical Procedure for the Analysis of Radon Anomalies Associated With Seismic Activity”. Annals of Geophysics 56, no. 1 (April 19, 2013): R0106. Accessed November 28, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/5570.