@misc{indiciae9a806a9a53a0,
  title = {Microfractures produced by a laboratory scale hypervelocity impact into granite},
  author = {Siegfried, R. W., II and Simmons, G. and Richter, D. and Hoerz, F.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19780057727},
  note = {Source identifier: 19780057727}
}