TY  - RPRT
TI  - Discrete element methods for the plastic analysis of structures subjected to cyclic loading.
AU  - Armen, H., Jr.
AU  - Isakson, G.
AU  - Pifko, A.
PY  - 1967
UR  - https://ntrs.nasa.gov/citations/19670044984
ID  - 19670044984
ER  -