629.101515
N331P
           Nayfeh, Ali Hasan
               Perturbation methods \ Ali Hasan Nayfeh - New York : John Wileg and Sons, 1973.
               xii, 425p. - Pure and applied mathematics; A Willey-interscience series of texts, monograph and tracts/ed by Lipman Bers .
                ISBN: 0-471-63059-4

130941
                Subjects: Perturbation (Mathematics); Asymptotic expansions; Differential equations-Numerical solutions.