H.J. Zwart, P. Hartman, A. C. Tobi. 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). njg [Internet]. 1984Jan.1 [cited 2026Mar.31];:129-30. Available from: https://njgjournal.nl/index.php/njg/article/view/13295