1. A. I. Kitaigorodsky, Molecular Crystals (Nauka, Moscow, 1971).
2. Nonlinear Optical Properties of Organic Molecules and Crystals, Ed. by D. S. Chemla and J. Zyss (Academic, New York, 1987), Vols. 1, 2.
3. A. Gavezzotti and G. Filippini, J. Am. Chem. Soc. 117, 12299 (1995).
4. J. K. Whitsell, R. E. Davis, L. L. Sanders, et al., J. Am. Chem. Soc. 113, 3267 (1991).
5. G. R. Desiraju, Crystal Engineering (Elsevier, Amsterdam, 1989).