Christiansen, Flemming G., and Jørgen A. Bojesen-Koefoed. “Inventory of Onshore Petroleum Seeps and Stains in Greenland: A Web-Based GIS Model”. GEUS Bulletin 47 (September 23, 2021). Accessed November 30, 2021. https://geusbulletin.org/index.php/geusb/article/view/6519.