@misc{indiciae1897acd8e86a,
  title = {Elastodynamic response of hollow balls},
  author = {Ling, F. F. and Chow, C. Y. and Rivera, M. E.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/19750028107},
  note = {Source identifier: 19750028107}
}