@misc{indiciaedeefb57f7608,
  title = {Variable frequency pulsed phase-locked loop method for measuring material nonlinearity},
  author = {Yost, William T. and Cantrell, John H.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930035678},
  note = {Source identifier: 19930035678}
}