1. E.D. Nogueira, J.M. Regife, and P.M. Blythe, “Zincex—The Development of a Secondary Zinc Process,” Chemistry and Industry, 2 (January 1980), pp. 63–67.
2. E.D. Nogueira, J.M. Regife, and M.P. Viegas, “Design Features and Operating Experience of the Quimigal Zincex Plant” (Paper presented at the 111th AIME Annual Meeting, Dallas, Texas, 1982), pp. 59–76.
3. D. Martín et al., “Process for the Production of Electrolytic Zinc or High Purity Salt from Secondary Zinc Raw Materials” U.S. patent 4,401,531 (1983).
4. G. Díaz and D. Martín. “The Modified Zincex Process: The Clean, Safe and Profitable Solution to the Zinc Secondaries Treatment” (Paper presented at the 3rd European East-West Conference on Materials Strasbourg, France, 1992).
5. “Process for the Continuous Production of High Purity Electrolytic Zinc,” Spain patent P9902777 (1999); and PCT ES00/0458.