1. Hegg, D.A., P.V. Hobbs, and L.F. Radke, Observations of the modification of cloud condensation nuclei in wave clouds, J. Rech. Atmos., 14, 217–222, 1980.
2. Twomey, S., On the composition of cloud nuclei in the northeastern United States, J. de Rech. Atmos., 3, 281–285, 1968.
3. Browning, K.A., and F.H. Ludlam, Airflow in convective storms, Q. J. Roy. Meteor. Soc., 88, 117–135, 1962.
4. Vali, G., M. Christensen, R.W. Fresch, E.L. Galyan, L.R. Maki, and R.C. Schnell, Biogenic ice nuclei. II: Bacterial sources, J.Atmos. Sci., 33, 1565–1570, 1976.
5. Cotton, W.R., Numerical simulation of precipitation development in supercooled cumuli. Part I: Mon. Wea. Rev., 11, 757–763, 1972a.