1. Alford R L & Liu J J 1974 The orbital decay and lifetime (LIFTIM) prediction programme, Report M-240-1278, Northrop Services Inc.
2. Bailey A B & Hiatt J 1972AIAA J.
10 1436
3. Barry B F, Pimm R S & Rowe C K 1971 Techniques of orbital decay and long-term Ephemeris prediction for satellites in earth orbit, NASA-CR-121053
4. Bedinger J F 1970J. Geophys. Res.
75 683
5. Benson R H, Fleischman E F & Hill R J 1968Astron. Aeronaut.
6 39