Koch, Eske, E. Fjeldsø Christensen, and Erik Thomsen. “Geology of the Søby-Fasterholt Area. Text”. Danmarks Geologiske Undersøgelse Serie A 22 (March 10, 1989): 1–171. Accessed May 5, 2024. https://geusjournals.org/index.php/seriea/article/view/7042.