@misc{indiciae712858f3a85e,
  title = {Airspace Safety Threshold Study: Status Update to SC-228 DAA Safety Sub-Group},
  author = {Thipphavong, David and Johnson, Marcus and Park, Chunki},
  year = {2014},
  url = {https://ntrs.nasa.gov/citations/20190027668},
  note = {Source identifier: 20190027668}
}