Jeker, Philipp, and Urs Krähenbühl. “Sulfur Profiles of the Twentieth Century in Peat Bogs of the Swiss Midlands Measured by ICP-OES and by IC”. CHIMIA 55, no. 12 (December 19, 2001): 1029. Accessed May 3, 2024. https://www.chimia.ch/chimia/article/view/2001_1029.