@misc{indiciaeec5cf6e6faef,
  title = {A geometric nonlinear degenerated shell element using a mixed formulation with independently assumed strain fields},
  author = {Graf, Wiley E.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19920015850},
  note = {Source identifier: 19920015850}
}