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2. Schmidt, O., and Meyer, E., U. S. Patent 1,959,930 (1934).
3. Zemplen, G., and Laszlo, E. D., Ber.48, 915 (1915). Hess, K., and Messmer, E., Ber.54, 499 (1921).
4. Oden, S., Arkiv Kemi Mineral Geol.6, No. 18 (1917).Ibid. Oden, S., Arkiv. Kemi Mineral Geol.7 No. 15 and 16 (1918).
5. Irvine, J. C., and Gilchrist, H. S., J. Chem. Soc.125, 1 (1924).