H. N. A. Priem, N. A. I. M. Boelrijk, E. H. Hebeda, E. A. T. Verdurmen, & R. H. Verschure. (1977). A note on the isotopic age of Beryl pegmatites near Rama, Suriname. Netherlands Journal of Geosciences, 83-84. Retrieved from https://njgjournal.nl/index.php/njg/article/view/14291