Kalsbeek, F. “Use of Rb-Sr Isotope Data to Constrain the Time of Deposition of Precambrian Metasediments: An Example from Hamborgerland, West Greenland”. Rapport Grønlands Geologiske Undersøgelse, vol. 159, Jan. 1993, pp. 95-100, doi:10.34194/rapggu.v159.8216.