TY  - BOOK
AU  - Venkatesh Y V
TI  - Energy methods in time-variying systems stability and instability analyses
T2  - Lecture notes in physics; 68
U1  - B9:7, L7 
PY  - 1977///
CY  - Berlin
PB  - Springer Verlag        
KW  - Astrophysics
ER  -