REFERENCES
- Bullen, J. M., Nature, 192 (1961), 542.
- Chun-Ming Huang, J. geophy. Res., 65 (1960), 897.
- Cummack, J. atmos. terr. Phys., 22 (1961), 298.
- Herrinck, P., Some Ionospheric Results Obtained During the IGY (1959), 18.
- Maeda, H., Rep. Ion. Res., Japan, 9 (1955), 60.
- Rao, C. S. R., J. atoms. terr. Phys., 24 (1962), 729.
- Rao, C. S. R., Nature, 198 (1963), 276.
- Roy, J. M., J. Inst. Telecom. Engrs, 2 (1955), 45.
- Sarma, N. V. G. & Mitra, A. P., J. sci. industr. Res., 15B (1955), 320.
- Schmerling, E. R., J. geophy. Res., 65 (1960), 1072.