@misc{indiciaec3635cbbc980,
  title = {Practical aspects of on-orbit modal identification using free-decay data},
  author = {Schenk, Axel and Pappa, Richard S.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19930006545},
  note = {Source identifier: 19930006545}
}