1. C. Palmer:Am. J. Sci., 1909, vol. 28, pp. 353–56.
2. R. Miller:Am. Mineral., 1945, vol. 30, pp. 65–75.
3. L.E. Lynd, H. Sigurdson, C.H. North, and W.W. Anderson:Trans. AIME Min. Eng., 1954, vol. 6, pp. 817–24.
4. M.G. Dyadchenko and A. Ya. Khatuntseva:Dokl. Akad. Nauk SSSR, 1960, vol. 132, pp. 435–38.
5. A.D. Bykov:Dokl. Akad. Nauk SSSR, 1964, vol. 156, pp. 567–70.