M.J. van der Meulen, M.P.E. de Kleine, J.G. Veldkamp, C.W. Dubelaar, & H.S. Pietersen. (2004). The sand extraction potential of embedded land surface lowering in the Netherlands. Netherlands Journal of Geosciences, 83, 147-151. https://doi.org/10.1017/S0016774600020102