@misc{indiciaec04b0ea6eeb5,
  title = {Modal vector estimation for closely-spaced-frequency modes},
  author = {Craig, R. R., Jr. and Chung, Y.-T. and Blair, M. A.},
  year = {1985},
  url = {https://ntrs.nasa.gov/citations/19860062373},
  note = {Source identifier: 19860062373}
}