1. New Process in Nickel and Cobalt Metallurgy;Borbat,1976
2. Industrial process for separation of nickel;Fekete,1973
3. The method of purification of nickel sulfate solution from zinc mixtures;Krynicki,1976
4. Removal of traces of Ni from Co solutions;Marakova,1979
5. A comparative study of some chelating ion exchange resins for applications in hydrometallurgy;Melling,1984