@misc{indiciae1ae5bf9389ee,
  title = {Optical-frequency conversion in gases using Gaussian laser beams with different confocal parameters.},
  author = {G Hilber and DJ Brink and A Lago and R Wallenstein},
  year = {1988},
  doi = {10.1103/physreva.38.6231},
  url = {https://pubmed.ncbi.nlm.nih.gov/9900382/},
  note = {Source identifier: 9900382}
}