Schovsbo, Niels H., Arne T. Nielsen, and Kurt Klitten. “The Lower Palaeozoic Now Fully Cored and Logged on Bornholm, Denmark”. GEUS Bulletin 33 (July 7, 2015): 9–12. Accessed June 28, 2022. https://geusbulletin.org/index.php/geusb/article/view/4477.