@misc{indiciae0fc1522aa0f1,
  title = {Engineering study of the rotary-vee engine concept},
  author = {Willis, Edward A. and Bartrand, Timothy A. and Beard, John E.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890016636},
  note = {Source identifier: 19890016636}
}