Giacaglia, Giorgio E. O Perturbation methods in non-linear systems [by] G. E. O. Giacaglia - New York Springer-Verlag 1972 - viii, 369 p 26 cm - Applied mathematical sciences (Springer-Verlag New York Inc.) v. 8 . Contine bibliogr. p.560 si index p. 549 ISBN: 0387900543 LCCN: 72087714 Subjects--Topical Terms: Differential equations, NonlinearPerturbation (Mathematics) Dewey Class. No.: 531.30151738