@misc{indiciae51b7438cbaba,
  title = {Relative Sensor with 4(pi) Coverage for Formation Flying Missions},
  author = {Tien, Jeffrey Y. and Purcell, George H., Jr. and Sirinivasan, Jeffrey M. and Young, Lawrence E.},
  year = {2004},
  url = {https://ntrs.nasa.gov/citations/20090007666},
  note = {Source identifier: 20090007666}
}