@misc{indiciae011674c0930a,
  title = {Harmonic multiplication using resonant tunneling},
  author = {Sollner, T. C. L. G. and Brown, E. R. and Goodhue, W. D. and Correa, C. A.},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19890026579},
  note = {Source identifier: 19890026579}
}