@misc{indiciae05e10e83b301,
  title = {Positive-P representation for second-harmonic generation: Analytic and computational results.},
  author = {KJ McNeil and IJ Craig},
  year = {1990},
  doi = {10.1103/physreva.41.4009},
  url = {https://pubmed.ncbi.nlm.nih.gov/9903574/},
  note = {Source identifier: 9903574}
}