@misc{indiciae61196c45103a,
  title = {Spherical harmonic analyses for the spheroidal earth.},
  author = {Kahle, A. B. and Kern, J. W. and Vestine, E. H.},
  year = {1964},
  url = {https://ntrs.nasa.gov/citations/19660031325},
  note = {Source identifier: 19660031325}
}