TY  - BOOK
AU  - Bogoliubov N N
AU  -  Mitropolsky Y A
TI  - Asymptotic methods in the theory of non-linear oscillations
U1  - B7:5, K1 
PY  - 1961///
CY  - Delhi
PB  - Hindustan Publishing Corpn. India     
KW  - MATHEMATICS
N1  - DSK Collection
ER  -