@misc{indiciae1464eb176378,
  title = {Gravitational field modes GEM 3 and 4},
  author = {Lerch, F. J. and Wagner, C. A. and Putney, B. H. and Sandson, M. L. and Brownd, J. E. and Richardson, J. A. and Taylor, W. A.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19730012156},
  note = {Source identifier: 19730012156}
}