REFERENCES
- Budden, K. G., Radio Waves in the Ionosphere (Cambridge University Press), 1961.
- Mitra, S. K., The Upper Atmosphere, Second edition (The Asiatic Society, Calcutta), 1952.
- Ratcliffe, J. A., Magnetoionic Theory (Cambridge University Press), 1959.
- Stratton, J. A., Electromagnetic Theory (McGraw-Hill Book Co. Inc., New York), 1941.