@misc{indiciae09e3785c2ac3,
  title = {Nonlinear estimation theory applied to the interplanetary orbit determination problem.},
  author = {Tapley, B. D. and Choe, C. Y.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19730030469},
  note = {Source identifier: 19730030469}
}