Gravesen, P., B. Nilsson, P. Rasmussen, and S. A. Schack Pedersen. “Borehole Logs from the Precambrian Basement on Bornholm, Eastern Denmark: Geology and Groundwater Flow”. GEUS Bulletin, vol. 31, June 2014, pp. 15-18, doi:10.34194/geusb.v31.4637.