H.J. Zwart, P. Hartman, & A. C. Tobi. (1984). To Professor Dr. Emile den Tex - on the occasion of his retirement from the chair of Petrology, Mineralogy and Crystallography, which he held at the State Universities of Leiden (since 1959) and Utrecht (1978-1983). Netherlands Journal of Geosciences, 129-130. Retrieved from https://njgjournal.nl/index.php/njg/article/view/13295