TY  - BOOK
AU  - Ibragimov, NH
AU  - Kovalev, V F
TI  - Approximate and renormgroup symmetries
SN  - 9787040251593
U1  - 512.542.6 
PY  - 2009///
CY  - New York
PB  - Springer
KW  - RENIRMGROUP
KW  - SYMMETRICS
ER  -