@misc{indiciaeda6f04fea57f,
  title = {Ultrasonic characterization of surface flaws using oblique angle backscattering technique},
  author = {Chern, Engmin J. and Cantrell, John H., Jr.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19900066370},
  note = {Source identifier: 19900066370}
}