P. A. Riezebos, M. de Bruin and R. P. W. Duin (1981) “Ore-textural and geochemical features of Bohnerz and Rasenerz concretions in Gutland (Luxembourg)”, Netherlands Journal of Geosciences, pp. 517-529. Available at: https://njgjournal.nl/index.php/njg/article/view/13658 (Accessed: 4April2026).