1. Collisions and transport of electrons in the ionosphere;Aggarwal;Indian Journal of Radio and Space Physics,1980
2. Andrews, D.G., Holton, J.R., Leovy, C.B., 1987. Middle Atmosphere Dynamics. Academic, San Diego, CA, 489pp.
3. International geomagnetic reference field;Barton;Journal of Geomagnetism and Geoelectricity,1997
4. Study of the lower ionosphere using partial reflection, 1, experimental technique and method of analysis;Belrose;Journal of Geophysical Research,1964
5. The partial-reflection experiment;Belrose;Radio Science,1964