Upton, B. 1964. 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. Bulletin Grønlands Geologiske Undersøgelse. 48, (Dec. 1964), 1–80. DOI:https://doi.org/10.34194/bullggu.v48.6582.