00406nam a22001457a 4500003000400000005001700004008004100021082001800062100002300080245006600103260002700169300001900196653001600215653002900231OSt20250527122136.0250527b        |||||||| |||| 00| 0 eng d  a515.392bN23I  aNayfeh, Ali Hasan   aIntroduction to perturbation techniques cby Ali Hasan Nayfeh  aNew DelhibWileyc2014  axiv, 519p.bPB  aMathematics  aPerturbation techniques