@misc{indiciae86f0cea28dc2,
  title = {Optical testing of off-axis parabolic segments without auxiliary optical elements},
  author = {Meinel, Aden B. and Meinel, Marjorie P.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890037326},
  note = {Source identifier: 19890037326}
}