@misc{indiciaebb9cc7204bbd,
  title = {Midcourse navigation using statistical filter theory, a manual theodolite, and symbolic computer control},
  author = {Christensen, J. V. and Kipping, E. D.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670008471},
  note = {Source identifier: 19670008471}
}