@misc{indiciae905fac0e53b5,
  title = {Direct quasi-phase-matched fourth-harmonic generation.},
  author = {Xianfeng Chen and Yuping Chen and Yuxing Xia},
  year = {2005},
  doi = {10.1364/ao.44.001028},
  url = {https://pubmed.ncbi.nlm.nih.gov/15751694/},
  note = {Source identifier: 15751694}
}