GRAVESEN, P.; ROLL JAKOBSEN, P. Pre-Quaternary rocks and sediments with a high level of radioactivity in Denmark. GEUS Bulletin, Copenhagen, Denmark, v. 35, p. 31–34, 2016. DOI: 10.34194/geusb.v35.4903. Disponível em: https://geusbulletin.org/index.php/geusb/article/view/4903. Acesso em: 28 jun. 2022.