@misc{indiciaec66af2f0a37f,
  title = {Current status of plane crack toughness testing.},
  author = {Brown, W. F., Jr. and Srawley, J. E.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19660056515},
  note = {Source identifier: 19660056515}
}