A. Demoulin, A. Becker, G. Rixhon, R. Braucher, D. Bourlès, and L. Siame. 2012. “Valley Downcutting in the Ardennes (W Europe): Interplay Between Tectonically Triggered Regressive Erosion and Climatic Cyclicity”. Netherlands Journal of Geosciences 91 (September):79 - 90. https://doi.org/10.1017/S0016774600001517.