1. Mitra, S. K.: General Aspects of Upper Atmospheric Physics. Proc. Conf. on Ionospheric Phys., pt. A, no. 11, Geophys. Res. Div., Air Force Cambridge Res. Center, Cambridge, Mass., 1950.
2. Kallman, H. K.: Physical Properties of the Upper Atmosphere. RM-841, Rand Corp., Santa Monica, California, 1952.
3. The Pressure, Density, and Temperature of the Earth's Atmosphere to 160 KM;Havens;Jour. Geophys. Res.,1952
4. Pressures, Densities and Temperatures in the Upper Atmosphere;Phys. Rev.,1952
5. International Civil Aviation Organization and Langley Aeronautical Laboratory: Standard Atmosphere–Tables and Data for Altitudes to 65, 000 Feet. NACA Rep. 1235, 1955.