E. B. A. Bisdom, A. Gerlofsma, J. N. B. Poelman, P. A. Riezebos. Composite grains in heavy-mineral concentrates and their significance in the differentiation of surface deposits at the confluence of the Maas (Meuse) and Roer (Rur) rivers. njg [Internet]. 1978Jan.1 [cited 2026Mar.30];:407-16. Available from: https://njgjournal.nl/index.php/njg/article/view/14167