@misc{indiciae87b228d67ded,
  title = {Simple waveguide reflection maser with broad tunability},
  author = {Flesner, L. D. and Schultz, S. and Clauss, R.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770067327},
  note = {Source identifier: 19770067327}
}