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  - 1970
UR  - https://ntrs.nasa.gov/citations/19700050522
ID  - 19700050522
ER  -