TY  - BOOK
AU  - Fucik S
AU  -  Kufner A
TI  - Nonlinear differential equations
T2  - Studies in applied mechanics; 2
U1  - B33, M0 
PY  - 1980///
CY  - Amsterdam
PB  - Elsevies Scientific Pub       
KW  - Differential equation
ER  -