@misc{indiciaec8ea048ac29d,
  title = {Optimum digital filter study for strapdown inertial navigation system initial alignment Final report, 8 Jan. 1968 - 8 Jul. 1968},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690001548},
  note = {Source identifier: 19690001548}
}