1. C. Herring in “Structures and Properties of Solid Surfaces”, Eds. R. Gomer and C.S. Smith, University of Chicago Press, USA (1953).
2. For a review on the influence of applied electric field on the reduction of the activation barrier and binding energy see: E.W. Muller and T.T. Tsong, in “Field Ion Microscopy: Principles and Applications”, (Elsevier, New York, 1969); Prog. Surface Sci. 1,1 (1974).
3. F.A. Nichols and W.W. Mullins, J. Appl. Phys. 36, 1826 (1965).
4. Vu Thien Binh and R. Uzan, Surface Sci. 179, 540 (1987).
5. F. O. Goodman and N. Garcia, Phys. Rev. B 43, 4728 (1991).