@misc{indiciae2c6a245c4bd2,
  title = {On the utilization of a flexible bar as a spatial filter},
  author = {Aupperle, F. A. and Lambert, R. F.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19710035708},
  note = {Source identifier: 19710035708}
}