@misc{indiciae8b45e50520c6,
  title = {Low speed, long term tracking electric drive system has zero backlash},
  author = {Richter, H. L. and Stoller, F. W.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670000220},
  note = {Source identifier: 19670000220}
}