Hoffmann , N., H. Jödicke, and P. Gerling. “The Distribution of Pre-Westphalian Source Rocks in the North German Basin – Evidence from Magnetotelluric and Geochemical Data”. Netherlands Journal of Geosciences 80, no. 1 (April 1, 2001): 71-84. Accessed April 6, 2026. https://njgjournal.nl/index.php/njg/article/view/11144.