1. A. I. Belyaev, this volume, p. 3; V. I. Yavoiskii, ibid., p. 17; V. N. Eremenko and V. I. Nizhenko, ibid., p. 28
2. V. D. Kuznetsov, Surface Energy of Solids, Moscow, 1954.
3. L. L. Kunin, Surface Phenomena in Metals, Moscow, 1955.
4. V. K. Semenchenko, Surface Phenomena in Metals and Alloys, 1957.
5. Van der Walls, Z. phys. Chem. 13:657, 1894.