1. O. Evrard et al., “Ferrates of Alkali or Alkaline Earth Metals, Their Preparation and Their Industrial Applications” (International patent WO 91/07352, 1991).
2. N. Kanari et al., JOM, 53 (11) (2001), pp. 32–33.
3. N. Kanari et al., EPD Congress 1999, ed. B. Mishra, pp. 17–28.
4. P. Pascal et al., Nouveau Traité de Chimie Minérale, Tome II (2) (Paris: Masson et Cie, 1963), p. 51.