1. Nocturnal ion composition in the height range of 200–1000 km for solar minimum condition;Bhatnagar;RPU Scient. Rep. No. 42,1968
2. Daytime ion composition in the height range of 150–1500 km for solar minimum condition;Bhatnagar;J. atmos. terr. Phys.,1969
3. Review of the properties of the lower thermosphere;Champion,1969
4. COSPAR International Reference Atmosphere;Cira,1965
5. Suggestion of a second isopycnic level at 80–90 km over Churchill;Cole;J. geophys. Res.,1961