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Norway | |
| Butler, J. R. (1958) Rare earths in some niobate-tantalates. Mineralogical Magazine and Journal of the Mineralogical Society, 31 (240). 763-780 doi:10.1180/minmag.1958.031.240.05 |
| Bjørlykke, Knut (1934) The mineral paragenesis and classification of the granite pegmatites of Iveland, Setesdal, Southern Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 14 (3-4) 211-311 |
| Frigstad, Ole Fridtjof (1968) En undersøkelse av cleavelandittsonerte pegmatittganger i Iveland-Evje, Nedre Setesdal, Hovedfagsoppgave (Thesis), University of Oslo. 1-222 |