00486nam a2200181 a 450000500170000002000180001708200180003510000260005310000240007924500460010326000290014930000250017849000310020350000500023460000080028485600060029285600060029820251203112345.0  a9783642002274  a621.3694bIBR  aIbragimov, Nail H.d_  aKovalev, Vladimir F  aApproximate and renormgroup symmetriesb_  aNew YorkbSpringerc2009  aiii,145p.c24cm.bHB  aNonlinear Physical Science  aincludes bibliographical references and index  bc_  f_  a_