@misc{indiciaef1d9971c1de3,
  title = {Optical nulling apparatus and method for testing an optical surface},
  author = {Olczak, Eugene and Hannon, John J. and Dey, Thomas W. and Jensen, Arthur E.},
  year = {2008},
  url = {https://ntrs.nasa.gov/citations/20080020429},
  note = {Source identifier: 20080020429}
}