“The geology of Tugtutôq and neighbouring islands, South Greenland. Part III. Olivine gabbros, syeno-gabbros and anorthosites. Part IV. The nepheline syenites of the Hviddal composite dyke” (1964) Bulletin Grønlands Geologiske Undersøgelse, 48, pp. 1–80. doi:10.34194/bullggu.v48.6582.