1. Equatorial plasma fountain and its effects: possibility of additional layer;Balan;Journal of Geophysical Research,1995
2. Measurement of total electron content and the equivalent slab thickness of the mid latitude ionosphere;Bhonsle;Radio Science,1965
3. Equivalent slab thickness of the ionosphere over 26_ N through the ascending half of a solar cycle;Bhuyan;Annales Geophysicae,1986
4. International reference ionosphere 2000;Bilitza;Radio Sciences,2001
5. Seasonal variation of the O/N2 ratio in the F1 region;Cox;Journal of Geophysical Research,1970