TY  - BOOK
AU  - Bogaevski, V. N.
AU  - Povzner, A.
TI  - Algebraic methods in nonlinear pertubation theory
T2  - Applied Mathematical Sciences
SN  - 0387974911
U1  - 515.35 
PY  - 1991///
CY  - New York
PB  - Springer-Verlag
ER  -