1. Bose, M. K.: Petrology of the sörkedalite — A primitive rock from the Alkali Igneous Province of Oslo. Vid.-Akad. Skr. I. Mat. Nat. Kl. Ny Serie, No, 1–28 (1969).
2. Brögger, W. C.: Die Eruptivgesteine des Kristianiagebietes. III. Das Ganggefolge des Laurdalits. Vid.-Akad. Skr. I. Mat. Nat. Kl. 1897. No 6, 1–377 (1898).
3. Brögger, W. C.Die Eruptivgesteine des Oslogebietes. VII. Vid.-Akad. Skr. I. Mat. Nat. Kl. No. 1, 78–80 (1933).
4. Buddington, A. F., Fahey, J., Vlisidis, A.: Thermometric and Petrogenetic significance of titaniferous magnetite. Am. J. Sci. 253, 497–532 (1955).
5. Buddington, A. F. Lindsley, D. H.: Iron-Titanium Oxide Minerals and Synthetic Equivalents. J. Petrol. 5, 310–357 (1964).