IMBÒ, G., and L. CASERTANO. “ANALISI RADIOATTIVA DELLE ROCCE COL METODO FOTOGRAFICO”. Annals of Geophysics 6, no. 3 (November 25, 1953): 315–320. Accessed September 20, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/5782.