@misc{indiciae940a86c380a9,
  title = {Structural response and input identification},
  author = {Shepard, G. D. and Callahan, J. C. and Mcelman, J. A.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810011936},
  note = {Source identifier: 19810011936}
}