P.F.M. van Gaans, S.P. Vriend, and R.D. Schuiling. “Integral Rock Analysis: A New Approach in Lithogeochemical Exploration With Use of X-Ray Fluorescence Spectrometry”. Netherlands Journal of Geosciences (January 1, 1986): 205-213. Accessed April 5, 2026. https://njgjournal.nl/index.php/njg/article/view/13143.