| Instruments | Langer (1988) | |
| Cemic et al. (1986) | ||
| Frentrup and Langer (1982) | ||
| Langer and Frentrup (1979) | ||
| Langer and Abu-Eid (1977) | ||
| Bell and Mao (1972c) | ||
| Faye (1971b) | ||
| Burns (1966) | ||
| Intervalence charge transfer | Burns (1981) | |
| Burns et al. (1979) | ||
| Smith (1977) | ||
| Smith and Strens (1976) | ||
| Loeffler et al. (1975) | ||
| general theory | Robbins and Strens (1968) | |
| Ilvaite | Fe | Güttler et al. (1989) |
| Amthauer and Rossman (1984) | ||
| Iowaite | Fe IVCT | Braithwaite et al. (1994) |
| Iron oxides | Singer (1982) | |
| hematite | Fe3+ | Bell et al. (1975) |