@misc{indiciae70557bc1479b,
  title = {Structural modes of fracture.},
  author = {Gerberich, W. W. and Parker, E. R. and Zackay, V. F.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690049237},
  note = {Source identifier: 19690049237}
}