1. H. W. Sheffer and L. G. Evans:Bureau of Mines I.C., 1968, no. 8341, 57 pp.
2. J. A. Harris:Proc. Australian Inst. Mining Met., 1969, no. 230, pp. 81–92.
3. R. J. Roman, B. R. Benner, and G. W. Becker:SME-AIME Trans., 1974, vol. 256, pp. 247–52.
4. R. L. Braun, A. E. Lewis and M. E. Wadsworth:Solution Mining Symposium, Chapt. 21, pp. 295–323, American Institute of Mining, Metallurgical and Petroleum Engineers Inc., New York, 1974.
5. B. W. Madsen, M. E. Wadsworth, and R. D. Groves:SME-AIME Trans., 1975, vol. 258, pp. 69–74.