Jan H.M. Outhuis, and Jean T. Van Berkel. “Petrographic and Geochemical Evidence for Major and Trace Element Metasomatism in Recrystallized F Elsic Metatuffites from the Persberg Area, Bergslagen, Central Sweden”. Netherlands Journal of Geosciences (January 1, 1988): 411-424. Accessed April 7, 2026. https://njgjournal.nl/index.php/njg/article/view/13078.