@misc{indiciaeefe4ccc8d6bf,
  title = {Simulation gravity modeling to spacecraft-tracking data - Analysis and application},
  author = {Phillips, R. J. and Sjogren, W. L. and Abbott, E. A. and Zisk, S. H.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19790031864},
  note = {Source identifier: 19790031864}
}