@misc{indiciaefce3ea935045, title = {Phase-Modulation Gas-Correlation Spectroscopy}, author = {Rider, David M. and Schofield, John T. and Margolis, Jack S. and Mccleese, Daniel J.}, year = {1989}, url = {https://ntrs.nasa.gov/citations/19890000119}, note = {Source identifier: 19890000119} }