@misc{indiciae4df91a402693,
  title = {Elevation correction factors for E-PERM radon monitors.},
  author = {P Kotrappa and L R Stieff},
  year = {1992},
  doi = {10.1097/00004032-199201000-00011},
  url = {https://pubmed.ncbi.nlm.nih.gov/1727416/},
  note = {Source identifier: 1727416}
}