1. J.M.D. Coey, in: J.W. Stucki, B.A. Goodman, U. Schwertmann (Eds.), Iron in Soils and Clay Minerals, NATO ASI Series, Series C: Mathematical and Physical Sciences, vol. 217, 1985, p. 397.
2. Transformation of Trace Element-Substituted Maghemite to Hematite
3. The Iron Oxides, Structure, Properties, Occurence and Uses;Cornell,1996
4. Mineralogical and chemical characterization of wastes from the sulfuric acid industry in Falun, Sweden