@misc{indiciaea038310d13bb,
  title = {Multipolar contributions to coherent optical second-harmonic generation at an interface between two isotropic media: A quantum-electrodynamical calculation.},
  author = {XD Zhu and A Wong},
  year = {1992},
  doi = {10.1103/physrevb.46.2540},
  url = {https://pubmed.ncbi.nlm.nih.gov/10003931/},
  note = {Source identifier: 10003931}
}