1. D. Belitskus:J. Metals, 1973, vol. 25, pp. 39–44.
2. O. K. Mehra, D. K. Bose, and C. K. Gupta:Trans. UM, April, 1973, pp. 1–7.
3. O. K. Mehra, D. K. Bose, and C. K. Gupta:Met. Trans., 1974, vol. 4, pp. 691–94.
4. B. Smith Hopkins:Vanadium, chapt. 14, Stripes Publishing Co., Champaign, 111., 1940,24 pp.
5. George van Arsdale:Hydrometallurgy of Base Metals, pp. 26–28, McGraw-Hill Book Co., Inc., New York, 1953.