@misc{indiciaea56642af4fa7,
  title = {Variable-Displacement Hydraulic Drive Unit},
  author = {Lang, D. J. and Linton, D. J. and Markunas, A.},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19860000078},
  note = {Source identifier: 19860000078}
}