1. "Nonlinear Optical Properties of Organic and Polymeric Materials, ed. by D.J. Williams, ACS Symposium Series 233, ACS, Washington, (1983).
2. “Polydiacetylenes,”ed. by D. Bloor and R.R. Chance, NATO ASI Series E102, Nijhoff, Dordrecht, 1985.
3. See, for example, R.R. Chance, M.W. Washabaugh and D.J. Hupe, in Ref. 2, p. 239.
4. C.P. de Melo and R. Silbey, “Nonlinear Polarizabilities of Conjugated Chains: Regular Polyenes, Solitons and Polar- ons,” submitted to Phys. Rev. Letters.
5. C.P. de Melo and R. Silbey, “Variational-Perturbational Treatment for the Polarizabilities of Conjugated Chains I. Theory and Linear Polarizabilities Results for Polyenes,” to be submitted to J. Chem. Phys.