I. Van Keer, R. Ondrak, Ph. Muchez, U. Bayer, M. Dusar, and W. Viaene. “Burial History and Thermal Evolution of Westphalian Coal-Bearing Strata in the Campine Basin (NE Belgium)”. Netherlands Journal of Geosciences 76 (January 1, 1998): 301-310. Accessed April 7, 2026. https://njgjournal.nl/index.php/njg/article/view/12313.