P.A. De Groot, and S.M.F. Sheppard. “Carbonate Rocks from W. Bergslagen, Central Sweden: Isotopic (C, 0, H) Evidence for Marine Deposition and Alteration by Hydrothermal Processes”. Netherlands Journal of Geosciences, Jan. 1988, pp. 177-88, https://njgjournal.nl/index.php/njg/article/view/13061.