TY  - BOOK
AU  - Bogaevski�i,V.N.
AU  - Povzner,A.
TI  - Algebraic methods in nonlinear perturbation theory
SN  - 0387974911 
PY  - 1991///
CY  - New York
PB  - Springer-Verlag
KW  - Perturbation (Mathematics)
KW  - Nonlinear theories
ER  -