TY  - BOOK
AU  - Bogoliubov N N
AU  - Mitropolsky Y A
TI  - Asymptotic methods in the theory of non linear oscillations
U1  - 515.355 
PY  - 1961///
CY  - Delhi
PB  - Hindustan publishing Corporation
KW  - Asymptotic methods
KW  - Oscillations
ER  -