Registro:

Referencias:

• Chang, Mitra, Long wavelength optical phonons in mixed crystals (1971) Advances in Physics, 20, p. 359. , For a review see
• Sen, Hartman, (1974) Phys. Rev., 9 B, p. 367
• Painter, (1973) Thesis, , Michigan State University, (unpublished) quoted in reference 2
• Schmidt, Disordered One-Dimensional Crystals (1953) Physical Review, 105, p. 425
• Doob, (1953) Stochastic Processes, , Wiley, New York
• Economou, Cohen, (1971) Phys. Rev., 4 B, p. 396
• Economou, Papatriantafillou, (1972) Solid State Commun., 11, p. 197
• Eggarter, Equivalence of Two Approaches to the Random Chain of Oscillators (1973) Physical Review B, 4 B, p. 1727
• Kittel, (1968) Introduction to Solid State Physics, p. 148. , 3rd edition, Wiley, New York
• Actually the iteration of (14) starting with the correct f1(z) = δ(z) converges only if the f's are considered as distributions (generalized functions). The discussion in appendix I, reference 4, is related to this property. We avoid such subtleties by requiring the iteration procedure to start with smooth functions. Nothing of physical interest is lost by this simplification

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