@misc{indiciaeeb93b94d341a,
  title = {The Gravity-Probe-B relativity gyroscope experiment - An update on progress},
  author = {Parkinson, Bradford W. and Everitt, C. W. Francis and Turneaure, John P.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19880047899},
  note = {Source identifier: 19880047899}
}