@misc{indiciaeb6771b3b631d,
  title = {A directional filter diplexer using optical techniques for millimeter to submillimeter wavelengths},
  author = {Erickson, N. R.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19780029166},
  note = {Source identifier: 19780029166}
}