00990nam a2200301 i 450099100114207970753620020507111834.0970308s1973 us ||| | eng b10179537-39ule_instLE00642846ExLDip.to Fisicaita510.41510.65629.1'01'515QA221Nayfeh, Ali Hasan442474Perturbation methods /Ali H. NayfehNew York :John Wiley & Sons,1973xii, 425 p. :ill. ;23 cm.Asymptotic expansionsDifferential equationsPerturbation (Mathematics).b1017953721-09-0627-06-02991001142079707536LE006 510.62+510.65 NAY12006000023672le006-E0.00-l- 00000.i1022029x27-06-02Perturbation methods84163UNISALENTOle00601-01-97ma -engus 01