@misc{indiciaeb9ee90bf2f1a,
  title = {Generating Second Harmonics In Nonlinear Resonant Cavities},
  author = {Kozlovsky, William J. and Nabors, C. David and Byer, Robert L.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19900000221},
  note = {Source identifier: 19900000221}
}