@misc{indiciae8e1e58f7e53e,
  title = {Making High-Pass Filters For Submillimeter Waves},
  author = {Siegel, Peter H. and Lichtenberger, John A.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910000409},
  note = {Source identifier: 19910000409}
}