1. Chalmers, J. A. (1967), Atmospheric Electricity, 2nd ed., Pergamon Press, New York, USA, 515 pp.
2. Choudhuri, R and S. Gopinath (1968), Studies of Atmospheric electrical potential gradient near the ground at Pune,Indian. J. Meteor. Geophys.,19: 435–442.
3. Cobb, W. E. and H. J. Wellls (1970), The electric conductivity of oceanic air and its correlation to global atmospheric pollution,J. Atmos. Sci..,27: 814–819.
4. Israel, H (1973),Atmospheric Electricity, Vol. II. Israel Program for Scientific Translations, Jerusalem, 796 pp.
5. Khemani, L. T., G. A. Momin, M. S. Naik, R. Kumar, and Bh. V. R. Murty (1985), Observations of Aitken nuclei and trace gases in different environments in India,Water, Air and Soil Pollution.,24: 131–140.