1. L.G. Stevens, L.A. Goeller, and M. Miller: CIMM, 14th Annual Conf., Edmonton, AB, Canada, 1975.
2. R.J. Weege and W.J. Beres: AIME Ann. Meeting, Denver, CO, Feb. 27, 1978.
3. E. Posnjak and H.E. Merwin: Am. J. Sci., 1919, vol. 47, pp. 311–48.
4. Cuban American Nickel: Eng. Min. J., 1957, vol. 79, p. 158.
5. E.B. Mancke: U.S. Patent 2, 762, 703, 1956.