H.W. Oosterink, Th. Simon, H. Hagdorn, and H. Winkelhorst. “Geo (Im) Pulse A Subrosion Pipe Fill in the Lower Muschelkalk, Winterswijk Quarry, Eastern Netherlands”. Netherlands Journal of Geosciences 85 (December 1, 2006): 293 - 297. Accessed March 26, 2026. https://njgjournal.nl/index.php/njg/article/view/11694.