@misc{indiciaeb3526212a3ed,
  title = {Aerodynamic Heat-Power Engine Operating on a Closed Cycle},
  author = {Ackeret, J. and Keller, D. C.},
  year = {1942},
  url = {https://ntrs.nasa.gov/citations/20030068025},
  note = {Source identifier: 20030068025}
}