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2. R. Hoppe, “Open Pit Copper Mining in Arizona,” Eng. Min. J. 178(6) (1977) p. 95–109.
3. M. Digre, “Energy Accounting in Hard Rock Comminution,” unpublished report prepared for the National Academy of Sciences, Trondheim University, Trondheim, Norway, 1979.
4. D.A. Rowland, Jr. and D.M. Kjos, “Rod and Ball Mills,” Mineral Processing Plant Design, ed. by A.L. Mular and R. Bhappu, Society of Mining Engineers of AIME, New York, New York, 1979, p. 239.
5. J.A. Herbst and K. Rajamani, “Control of Grinding Circuits,” Computer Methods for the 80’s, Society of Mining Engineers of AIME, New York, New York, 1979, p. 770.