1. An improved process for the simultaneous electrolytic production of zinc metal and manganese dioxide from zinc sulphide concentrate and manganese ores;Altekar;Indian Patent No. 521/Del/77,1977
2. Simultaneous refining of Zn and MnO2;Angelov;C.I.M. Bull., (Aug. 1971),1971
3. Difficulties in electrolytic zinc process;French;Chem. Met. Eng.,1917
4. Direct leaching of zinc sulphide concentrates by Sheritt Gordon;Forward;J. Metals,1959
5. Aqueous oxidation of elemental sulphur;Habashi;Ind. Eng. Chem. Fundamentals,1966