1. See articles by D. W. SHAW and E. KALDIS, in Crystal Growth, Theory and Techniques, Vol. 1, C.H.L. Goodman ed., Plenum, New York, 1974, pp. 1–48 and 49–192
2. Steele W.A., in The Interaction of Gases with Solid Surfaces, Pergamon, Owford, 1974
3. Ordering in Two Dimensions, 1980, Sinha S.K. ed., North Holland, New York.
4. Watson W.D. and Salpeter E.E., Astrophysical J. 174 (1972)321–340
5. Cole M.W. and Frankl D.R., Surf. Sci. 70 (1978) 585–616