@misc{indiciae6ac45fade0e8,
  title = {Heliotrope: A Solar Powered Hot Air Balloon Flight System},
  author = {Bowman, Daniel C.},
  year = {2020},
  doi = {10.2172/1615561},
  url = {https://www.osti.gov/biblio/1615561},
  note = {Source identifier: 1615561}
}