1. Boring , J. W. R. R. Humphris Drag coefficients for spheres in free molecular flow in O at satellite velocities Washington, D.C. 1973
2. Broglio , L. C. Arduini C. Buongiorno U. Ponzi G. Ravelli Diurnal density variations measured by the San Marco 3 satellite in equatorial orbit 1973
3. The properties of the neutral atmosphere;Champion;Space Res.,1972
4. Champion , K. S. W. D. F. Gillette I. M. Hussey Drag density data from the Cannon Ball 2 and Musket Ball satellites 1973
5. Density variations and atmospheric rotation below 200 km from the drag on the satellite OV 1-15;Ching;Space Res.,1972