@misc{indiciae862fcb79c78f,
  title = {Echelle efficiencies - Theory and experiment},
  author = {Schroeder, D. J. and Hilliard, R. L.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800062285},
  note = {Source identifier: 19800062285}
}