@misc{indiciaeaaac9b8bb139,
  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 = {1970},
  url = {https://ntrs.nasa.gov/citations/19700050522},
  note = {Source identifier: 19700050522}
}