@misc{indiciaec173266fc867,
  title = {The precision tracker},
  author = {J. V. Anders and E. F. Higgins, Jr. and J. L. Murray and F. J. Schaefer, Jr.},
  year = {1963},
  url = {https://ntrs.nasa.gov/citations/19640000980},
  note = {Source identifier: 19640000980}
}