C. Peeters, Ph. Muchez, and W. Viaene. “Paleogeographic and Climatic Evolution of the Moliniacian (lower Visean) in Southeastern Belgium”. Netherlands Journal of Geosciences 71 (January 1, 1992): 39-50. Accessed April 3, 2026. https://njgjournal.nl/index.php/njg/article/view/12529.