@misc{indiciaeaf6a86739212,
  title = {A quadrilateral shell element using a mixed formulation},
  author = {Saleeb, A. F. and Chang, T. Y. and Graf, W.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19870066522},
  note = {Source identifier: 19870066522}
}