1. Hydrometallurgical process for the production of copper;Atwood;U.S. Patent,1975
2. Laboratory studies on concentrate digestion by means of ferric sulphate;Bogdanowicz;Pr. nauk. Inst. Chem. Nieorg. PWr. (Pol.),1974
3. Three-stage leaching of copper concentrates with ferric sulphate;Bodanowicz;Pr. nauk. Inst. Chem. Nieorg. PWr.,1976
4. Untersuchungen über die Löslichkeiten von Salzen und Gasen in Wasser und wärigen Lösungen bei Temperaturen oberhalb 100°C;Bruhn;Z. anorg. und allgem. Chem.,1965
5. The kinetics of dissolution of synthetic chalcopyrite in aqueous acidic ferric sulphate solutions;Dutrizac;Trans. Metall. Soc. AIME,1969