PALUMBO, DONATO. “TEORIA PER LA DETERMINAZIONE DEL CONTENUTO RADIOATTIVO DEI MINERALI I”. Annals of Geophysics 6, no. 2 (November 25, 1953): 229–238. Accessed October 24, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/5776.