@misc{indiciae1553140f5b97,
  title = {A Personnel Launch System for safe and efficient manned operations},
  author = {Petro, Andrew J. and Andrews, Dana G. and Wetzel, Eric D.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910029217},
  note = {Source identifier: 19910029217}
}