@misc{indiciaec45b97f4fab7,
  title = {Altimeter crossover methods for precision orbit determination and the mapping of geophysical parameters},
  author = {Shum, C. K. and Schutz, B. E. and Tapley, B. D. and Zhang, B. H.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910025780},
  note = {Source identifier: 19910025780}
}