Midtgaard, H., and T. Olsen. “Sedimentological Studies in the Upper Cretaceous Coal-Bearing Strata of Southern Nûgssuaq, Central West Greenland”. Rapport Grønlands Geologiske Undersøgelse, vol. 145, Dec. 1989, pp. 32-37, doi:10.34194/rapggu.v145.8069.