@misc{indiciae801201a67ac4,
  title = {System for detecting substructure microfractures and method therefore},
  author = {Parthasarathy, S. P. and Narasimhan, K. Y.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800002263},
  note = {Source identifier: 19800002263}
}