@misc{indiciae4a0f33f3565a,
  title = {Propellant Flow Actuated Piezoelectric Igniter for Combustion Engines},
  author = {Wollen, Mark A.},
  year = {2015},
  url = {https://ntrs.nasa.gov/citations/20150003436},
  note = {Source identifier: 20150003436}
}