“Sandstones and Phosphatized Calcareous Sediments of the Lower Cambrian Rispebjerg Sandstone, Bornholm, Denmark”. Danmarks Geologiske Undersøgelse II. Række 113 (December 11, 1980): 1–39. Accessed October 18, 2025. https://geusjournals.org/index.php/raekke2/article/view/6904.