1. See Seifert, H., in Gomer, R., and Smith, C. S., Structure and Properties of Solid Surfaces (Univ. of Chicago Press, Illinois, 1953).
2. Willems, J., Z. Elektrochem., 56, 345 (1952); Z. Kristallog., 105, 53, 144, 149, 155 (1943).
3. Labes, M. M., and Ur, H., J. Org. Chem., 26, 4760 (1961).
4. Kronick, P. L., and Labes, M. M., J. Chem. Phys., 35, 2016 (1961).