@misc{indiciae080b656e1b15,
  title = {Progress in fracture mechanics},
  author = {Brown, W. F., Jr. and Shannon, J. L., Jr. and Brown, F., Jr.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700047683},
  note = {Source identifier: 19700047683}
}