[1]
E. B. A. Bisdom, A. Gerlofsma, J. N. B. Poelman and P. A. Riezebos 1978. 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. Netherlands Journal of Geosciences. (Jan. 1978), 407-416.