@misc{indiciaea34cfec34413,
  title = {Application of differenced tracking data types to the zero declination and process noise problems},
  author = {Rourke, K. H. and Ondrasik, V. J.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710024651},
  note = {Source identifier: 19710024651}
}