@misc{indiciae15e7e7238907,
  title = {Evaluation of strapdown guidance systems on interplanetary missions.},
  author = {Hitt, E. F. and Koenke, E. J.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690057964},
  note = {Source identifier: 19690057964}
}