James H. Baker, Rob H. Hellingwerf, and I.S. Oen. “Structure, Stratigraphy and Ore-Forming Processes in Bergslagen: Implications for the Development of the Svecofennian of the Baltic Shield”. Netherlands Journal of Geosciences, Jan. 1988, pp. 121-38, https://njgjournal.nl/index.php/njg/article/view/13056.