Fabricius, Ida L, et al. “The Use of Spectral Natural Gamma-Ray Analysis in Reservoir Evaluation of Siliciclastic Sediments: A Case Study from the Middle Jurassic of the Harald Field, Danish Central Graben”. GEUS Bulletin, vol. 1, Oct. 2003, pp. 349-66, https://doi.org/10.34194/geusb.v1.4677.