@misc{indiciae5902cc46c69b,
  title = {Design method for four-reflector type beam waveguide systems},
  author = {Betsudan, S. and Katagi, T. and Urasaki, S.},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19870009255},
  note = {Source identifier: 19870009255}
}