1. Aannestad, P. A. and Purcell, E. M.: 1973,Ann. Rev. Astron. Astrophys. 2, 309.
2. Abraham, F. F.: 1974,Homogeneous Nucleation Theory, Academic Press, New York.
3. Anisimov, S. I., Bonch-Bruevich, A. M., El'yashevich, M. A., Imas Ya, A., Pavlenko, N. A., and Romanov, G. S.: 1967,Soviet Phys.-Tech. Phys. 2, 945.
4. Arnold, J. R.: 1977,Comets, Asteroids, Meteorites (A. H. Delsemme, ed.,) The University of Toledo, p. 519.
5. Arrhenius, G.: 1977,NATO Advanced Study Institute on the Origin of the Solar System (S. F. Dermott, ed.), Wiley, New York (in press).