@misc{indiciae4dd8415ac4e9,
  title = {Engineering study on the rotary-vee engine concept},
  author = {Willis, Edward A. and Bartland, Timothy A. and Beard, John E.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890064121},
  note = {Source identifier: 19890064121}
}