@misc{indiciaea38360198cb5,
  title = {Trace gas absorption spectroscopy using laser difference-frequency spectrometer for environmental application},
  author = {Chen, W. and Cazier, F. and Boucher, D. and Tittel, F. K. and Davies, P. B.},
  year = {2001},
  url = {https://ntrs.nasa.gov/citations/20040088204},
  note = {Source identifier: 20040088204}
}