@misc{indiciaefc0d50167a82,
  title = {Discrete element methods for the plastic analysis of structures subjected to cyclic loading.},
  author = {Armen, H., Jr. and Isakson, G. and Pifko, A.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670044984},
  note = {Source identifier: 19670044984}
}