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Norway | |
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| 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. |
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| Dons, Johannes A. (1969) Interrupted creation of nepheline syenite pegmatite dikes in the Langesundsfjord area, S. Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 49 (2) 145-157 |
- Arøyskjærene (Arøy skerries)
| Knut Edvard Larsen -observation in field april 2003 |
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| 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 |
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| Knut Edvard Larsen observation in field and collection 20.04.2013 |
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| Segalstad, Tom Victor, Larsen, Alf Olav (1978) Chevkinite and perrierite from the Oslo region, Norway. American Mineralogist, 63 (5-6) 499-505 |
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| 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 |
