@article{UMNCC2015,
  author = "Jason Upchurch and C{\'e}sar Mu{\~n}oz and Anthony Narkawicz and Mar{\'{\i}}a Consiglio and James Chamberlain",
  title = "Characterizing the Effects of a Vertical Time Threshold for a Class of Well-Clear Definitions",
  journal = "Air Traffic Control Quarterly",
  volume = "23",
  number = "4",
  pages = "275-299",
  year = "2015"
}