1. For two excellent reviews in the field of non-equilibrium phase transitions and ordering phenomena, see e.g., J. D. Gunton, M. San Miguel, and P. S. Sahni, in Phase Transitions and Critical Phenomena. C. Domb and J. L. Lebowitz, eds. Vol. 8 (Academic Press, New York, 1983) p. 267 and H. Furukawa, Adv. Phys. 34, 703 (1985).
2. O. G. Mouritsen, Ann. N.Y. Acad. Sci. (in press).
3. Dynamics of Ordering Processes in Condensed Matter, S. Komura and H. Furukawa, eds. (Plenum Press, New York, 1988).
4. D. Kessler, J. Koplik, and H. Levine, Adv. Phys. 36, 255 (1988).
5. J. S. Langer, Science 243, 1150 (1989).