@misc{indiciae8207e0d6afc4,
  title = {An Empirical State Error Covariance Matrix for the Weighted Least Squares Estimation Method},
  author = {Frisbee, Joseph H., Jr.},
  year = {2011},
  url = {https://ntrs.nasa.gov/citations/20110014000},
  note = {Source identifier: 20110014000}
}