P. G. E. F. Augustinus, and H. Th. Riezebos. “Some Sedimentological Aspects of the Fluvioglacial Outwash Plain Near Soesterberg (The Netherlands)”. Netherlands Journal of Geosciences, Jan. 1971, pp. 341-8, https://njgjournal.nl/index.php/njg/article/view/14839.