Baartman, J.C, and Ole Bruun Christensen. “Contributions to the Interpretation of the Fennoscandian Border Zone”. Danmarks Geologiske Undersøgelse II. Række 102 (March 15, 1975): 1–47. Accessed May 7, 2024. https://geusjournals.org/index.php/raekke2/article/view/6893.