1. Solution chemistry of tungsten systems;Osseo-Asare;Metall. Trans. B,1982
2. Heats and free energies of formation of calcium tungstate, calcium molybdate and magnesium mobybdate;Barany;U.S. Bur. Mines, Rep. Invest.,1942
3. Oxidation Potentials;Latimer,1959
4. Hamilton, E.M., U.S. Pat. 1,261,383 (1918).