@misc{indiciae4be426d7705c,
  title = {Advanced propulsion - Cleaner and quieter.},
  author = {Beheim, M. A. and Antl, R. J. and Povolny, J. H.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720054013},
  note = {Source identifier: 19720054013}
}