@misc{indiciaecaa8619dec15,
  title = {Scalar limitations of diffractive optical elements},
  author = {Johnson, Eric G. and Hochmuth, Diane and Moharam, M. G. and Pommet, Drew},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19940012863},
  note = {Source identifier: 19940012863}
}