@misc{indiciae6fa411170c7a,
  title = {Theoretical three-and four-axis gimbal robot wrists},
  author = {Barker, L. K. and Houck, J. A.},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19860015697},
  note = {Source identifier: 19860015697}
}