1. Alkhazov, G. D., 1970, Sov. Phys. Tech. Phys., 15: 66.
2. Allis, W. P., 1975, Rev. Phys. Appl., 10: 97.
3. Badareu, E. and Popescu, I., 1965, “Gaz Ionisés,” Dunod, Paris.
4. Baker, C. T. H., 1977, “The Numerical Treatment of Integral Equations,” Clarendon, Oxford.
5. Boardman, A. D., Fawcett, W., and Rees, H. D., 1968, Solid State Commun., 6: 305.