TY  - BOOK
AU  - Ibragimov, Nail H.
AU  - Kovalev, Vladimir F
TI  - Approximate and renormgroup symmetries: _
T2  - Nonlinear Physical Science
SN  - 9783642002274
U1  - 621.3694 
PY  - 2009///
CY  - New York
PB  - Springer
KW  - 
N1  - includes bibliographical references and index
ER  -