Contributions to the National Geodetic Satellite Program by Goddard Space Flight CenterDavid E. Smith, M. A. Khan, F. J. Lerch et al.|Journal of Geophysical Research Atmospheres|1976Cited by 40
A gravitational field model for the earth.David E. Smith, C. A. Wagner, F. J. Lerch|NASA Technical Reports Server (NASA)|1973Cited by 13
Resonant perturbations of earth satellites in 2 day commensurable orbitsC. A. Wagner|NASA STI Repository (National Aeronautics and Space Administration)|1968Cited by 2