1. Direct pressure leaching of zinc blende with simultaneous production of elemental sulphur;Veltman,1980
2. Leaching of sulphide minerals under pressure;Björling;Metall,1954
3. Direct leaching zinc sulphide concentrates by Sherritt Gordon;Forward;J. Met.,1959
4. The catalyzed oxidation of zinc sulfide under acid pressure leaching conditions;Scott;Trans. TMS.AIME,1968
5. Beitrag zur Drucklaugung von Zinksulfid;Exner;Erzmetall,1969