1. F.P. Haver and M.M. Wong, “Recovery of Copper, Iron, and Sulfur from Chalcopyrite Concentrate Using a Ferric Chloride Leach,” J. Metals, 23 (2) (1971), pp. 25–29.
2. T.A. Phillips, “Economic Evaluation of a Process for Ferric Chloride Leaching of Chalcopyrite Concentrate,” BuMines IC, 8699 (1976), p. 22.
3. G.E. Atwood and C.H. Curtis, U.S. patent 3,785,944 (January 1974).
4. G.E. Atwood and C.H. Curtis, U.S. patent 3,879,272 (April 1975).
5. M.E. Cook and G.E. Atwood, U.S. patent 4,025,400 (May 1977).