TY  - RPRT
TI  - PLANS; a finite element program for nonlinear analysis of structures. Volume 2: User's manual
AU  - Pifko, A.
AU  - Armen, H., Jr.
AU  - Levy, A.
AU  - Levine, H.
PY  - 1977
UR  - https://ntrs.nasa.gov/citations/19770026591
ID  - 19770026591
ER  -