@misc{indiciae67f112fe9e0f,
  title = {Final design of a free-piston hydraulic advanced Stirling conversion system},
  author = {Wallace, D. A. and Noble, J. E. and Emigh, S. G. and Ross, B. A. and Lehmann, G. A.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19920068174},
  note = {Source identifier: 19920068174}
}