@misc{indiciae1dbcd7f9c6da,
  title = {Phase matching in second-harmonic generation using artificial periodic structures.},
  author = {Tang, C. L. and Bey, P. P.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730034736},
  note = {Source identifier: 19730034736}
}