H.J.A. Berendsen, and K.P. Volleberg. “New Prospects in Geomorphological and Geological Mapping of the Rhine-Meuse Delta - Application of Detailed Digital Elevation Maps Based on Laser Altimetry”. Netherlands Journal of Geosciences, vol. 86, Apr. 2007, pp. 15 -22, doi:10.1017/S0016774600021296.