I. Van Keer, R. Ondrak, Ph. Muchez, U. Bayer, M. Dusar, and W. Viaene. 1998. “Burial History and Thermal Evolution of Westphalian Coal-Bearing Strata in the Campine Basin (NE Belgium)”. Netherlands Journal of Geosciences 76 (January):301-10. https://njgjournal.nl/index.php/njg/article/view/12313.