1. W. Shockley, Phys. Rev. 56 (1939) 317.
2. E. W. Müller: Ergebn. d. exakt. Naturwiss. Vol. XXVII, Kap. III, 8, p. 290. Berlin-Göttingen-Heidelberg: Springer. 1953.
3. R. E. Schlier and H. E. Farnsworth: Semiconductor Surface Science (R. H. Kingston, ed.), p. 3. Philadelphia: Univ. of Pennsylvania Press. 1957; for a review see Proc. Symp. Structure of Surfaces, Surface Sci. 8 (1967) 1; a brief description of surface characterization by
4. LEED is given by e.g. S. G. Davison and J. D. Levine, ref. 1, p. 110.
5. W. E. Meyerhof, Phys. Rev. 71 (1947) 727.