@misc{indiciaeb06ee5ace7f1,
  title = {OD Covariance in Conjunction Assessment: Introduction and Issues},
  author = {Hejduk, M. D. and Duncan, M.},
  year = {2015},
  url = {https://ntrs.nasa.gov/citations/20150011109},
  note = {Source identifier: 20150011109}
}