@misc{indiciae9b1060b992f0,
  title = {Precipitable Water Vapor Derived from Archived GPS Zenith Path Delay Estimates},
  author = {Freedman, A. P. and Schulz, K. and Gross, R. S. and Herring, T. A. and Ryan, J. W.},
  year = {1994},
  url = {https://ntrs.nasa.gov/citations/20060037869},
  note = {Source identifier: 20060037869}
}