@misc{indiciae39a13e12edc5,
  title = {A voltage-tunable three-terminal Gunn device},
  author = {Schwartz, R. J. and Nahas, J. J.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720000517},
  note = {Source identifier: 19720000517}
}