Giacaglia, Giorgio E. O., 1935- Perturbation methods in non-linear systems / G. E. O. Giacaglia. - New York : Springer-Verlag, 1972. - viii, 369 p. ; 26 cm. - Applied Mathematical Sciences Vol. 8 . - Applied Mathematical Sciences (Springer-Verlag New York Inc.) ; Vol. 8. . Includes bibliogr. references ISBN: 0387900543 Subjects--Topical Terms: Differential equations, NonlinearPerturbation (Mathematics)