1. Separation and concentration of zinc, gallium, germanium, arsenic and selenium by coprecipitation with ferric hydroxide;Movikov;Radiokhimiya,1972
2. Extraction of gallium from discarded solutions from germanium production;Zekel;Tsvetnya Metallurgiya,1972
3. The chemistry of gallium;Sheka,1966
4. Japan Atomic Energy Research Institute;Ishimori;JAERI 1097,1966