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Norway | |
| Brøgger, Waldemar Christofer (1890, January) Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit-und Nephelinsyenite. Zeitschrift für Krystallographie und Mineralogie Vol. 16 (1) Walter de Gruyter GmbH |
| Larsen, Alf Olav, Andersen, Frode, Dahlgren, Sven, Larsen, Knut Edvard, Burvald, Ingulv - Ed. (2010) The Langesundsfjord - History, geology, pegmatites, minerals. Bode Verlag Gmbh. p.1-240. |
| Berge, Svein A. (n.d.) Personal communication. |
| Larsen, Alf Olav (1988) Helvite group minerals from syenite pegmatites in the Oslo Region, Norway. Contribution to the mineralogy of Norway, No. 68. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 68 (2) 119-124 |