@misc{indiciaec1723b250cc7,
  title = {An algorithm for propagating the square-root covariance matrix in triangular form},
  author = {Tapley, B. D. and Choe, C. Y.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19760040327},
  note = {Source identifier: 19760040327}
}