@misc{indiciae872e7a9336cf,
  title = {Gravity Probe B Timing System and Roll Phase Determination},
  author = {Jie, Li and Kolodziejczak, Jeffery},
  year = {2007},
  url = {https://ntrs.nasa.gov/citations/20070031692},
  note = {Source identifier: 20070031692}
}