I.S. Oen and R.H. Verschure (1985) “Isotopic age determinations in Bergslagen, Sweden: VI. acid metavolcanics of the Bergslagen Supracrustal Series, Grythyttan-Hjulsjo area ”, Netherlands Journal of Geosciences, pp. 175-179. Available at: https://njgjournal.nl/index.php/njg/article/view/13178 (Accessed: 30March2026).