@misc{indiciae49efdd1ac360,
  title = {Nonlinear susceptibilities as a function of several complex angular-frequency variables.},
  author = {K Peiponen},
  year = {1988},
  doi = {10.1103/physrevb.37.6463},
  url = {https://pubmed.ncbi.nlm.nih.gov/9943892/},
  note = {Source identifier: 9943892}
}