@misc{indiciaed014ad969c4c,
  title = {Study of rectangular-guide-like structures for millimeter wave transmission Progress report, 1 Jun. - 30 Sep. 1969},
  author = {Tischer, F. J.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700001727},
  note = {Source identifier: 19700001727}
}