Arend H. Damman. “Exhalative-Sedimentary Manganif Erous Iron Ores from the Gasborn Area, W. Bergslagen, Central Sweden”. Netherlands Journal of Geosciences (January 1, 1988): 433-442. Accessed April 4, 2026. https://njgjournal.nl/index.php/njg/article/view/13080.