1. Forward, R. L.: 1971, ?Gravitational Field Measurements of Planetary Bodies with Gravity Gradient Instrumentation?,Proc. AAS/AIAA Astrodynamics Specialists Conference, Fort Launderdale, Florida Aug. 17?19.
2. Forward, R. L.: 1973,Review of Artificial Satellite Gravity Gradiometer Techniques for Geodesy, First Internat. Sympos. on Use of Artificial Satellites for Geodesy and Geophysics, Athens, Greece; May 14?21.
3. Goldstein, H.: 1950,Classical Mechanics, Addison-Wesley Publishing Co., Cambridge, Mass.
4. Heller, W. G.: 1975,Gradiometer-aided Intertial Navigation, Report TR-312-5, prepared under Contract DMA 700-74-C-0075, The Analytical Sciences Corp. (TASC), Reading, Mass., U.S.A.
5. Lunar Polar Orbiter Program: 1975,Interim Technical Report X-703-75-141, Goddard Space Flight Center, Greenbelt, Md., U.S.A.