@misc{indiciae1d16d898bf5b,
  title = {Imaging performance of annular apertures. VI - Limitations by optical surface deviations},
  author = {Tschunko, Hubert F. A.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19880035870},
  note = {Source identifier: 19880035870}
}