@misc{indiciaef281a08c6edf,
  title = {Finite element analysis of structures in the plastic range},
  author = {Armen, H., Jr. and Levine, H. S. and Pifco, A.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710009801},
  note = {Source identifier: 19710009801}
}