1. Recovery of precious metals from metal sulphides;Genik-Sas-Berezowsky;US Pat. 4,070,182,1978
2. Recovery of gold and silver from oxidation leach residues by ammoniacal thiosulphate leaching;Genik-Sas-Berezowsky,1979
3. Dissolution of gold in ammoniacal thiosulfate solution;Tozawa,1981
4. Recovery of precious metals from difficult ores;Kerley;US Pat. 4,269,622,1981
5. Recovery of precious metals from difficult ores;Kerley;US Pat. 4,369,061,1983