Dawes, P., Friend, C., Nutman, A. and Soper, N. 1989. The Blokken gneisses: a re-appraisal. Rapport Grønlands Geologiske Undersøgelse. 146, (Dec. 1989), 83–86. DOI:https://doi.org/10.34194/rapggu.v146.8101.