TY  - RPRT
TI  - Poincare-Lighthill and linear-time-scales methods for linear perturbation problems.
AU  - Klimas, A.
AU  - Murphy, F. X., Jr.
AU  - Sandri, G.
PY  - 1973
UR  - https://ntrs.nasa.gov/citations/19730052950
ID  - 19730052950
ER  -