1. Philips Data Handbook,1974
2. Use of Mn- and Mg-based ferrites for negative-temperature-coefficient thermistors;Johnson;Am. Ceram. Soc. Bull.,1983
3. The impact of preparative conditions on the electrical properties of α-Fe2O3;de Wit,1980
4. Phase Equilibria among Oxides in Steelmaking;Muan,1965
5. The electrical properties of alpha ferric oxide—II. Ferric oxide of high purity;Gardner;J. Phys. Chem. Solids,1963