1. Beer, R., Norton, R. H., and Matonchik, J. V.: 1971, Astrophys. J. Lett. 68, L121.
2. Belton, M. J. S.: 1968, J.Atmospheric Sci. 25, 596.
3. Belton, M. J. S. and Hunten, D. M.: 1968, Astrophys. J. 154, 797.
4. Belton, M. J. S., Hunten, D. M., and Goody, R. M.: 1968, The Atmospheres of Mars and Venus, Gordon and Breach, New York, 69.
5. Byers, H. R.: 1965, Elements of Cloud Physics, University of Chicago Press, Chicago, Illinois.