@misc{indiciae3cf5406a66fc,
  title = {Free vibrations of thin isotropic oblate spheroidal shells},
  author = {Burgin, G. and Penzes, L. E.},
  year = {1965},
  url = {https://ntrs.nasa.gov/citations/19660013607},
  note = {Source identifier: 19660013607}
}