@misc{indiciaef4f5e31b4650,
  title = {BALLIST: A computer program to empirically predict the bumper thickness required to prevent perforation of the Space Station by orbital debris},
  author = {Rule, William Keith},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19940009647},
  note = {Source identifier: 19940009647}
}