@misc{indiciaeadfb4386d30c,
  title = {Analysis of transient, linear wave propagation in shells by the finite difference method},
  author = {Geers, T. L. and Sobel, L. H.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19720008223},
  note = {Source identifier: 19720008223}
}