1. Miyake, S., Sci. Papers Inst. Phys. Chem. Res. (Tokyo), 31, 161 (1937).
2. Sloman, H. A., J. Inst. Met., 49, 365 (1932).
3. Raub, E., Mitt. Forschungs Edelmetalle, 8, 77 (1934).
4. Hoar, T. P., and Price, L. E., Trans. Faraday Soc., 1938, Symposium on "Chemical Reactions involving Solids".
5. Wagner, C., Z. phys. Chem., B, 21, 25 (1933).