@misc{indiciae220d485fa7ed,
  title = {Spur gears: Optimal geometry, methods for generation and Tooth Contact Analysis (TCA) program},
  author = {Litvin, Faydor L. and Zhang, Jiao},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19880013832},
  note = {Source identifier: 19880013832}
}