@misc{indiciae96ddf5fe6c4d,
  title = {Precision pointing and tracking system /PPTS/},
  author = {Brown, T. K. and Leblanc, D. R. and Mettler, E. and Gaalema, S. D.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19780060474},
  note = {Source identifier: 19780060474}
}