PageHeader : Funkcialaj Ekvacioj, 10 (1967), 1-13 Title : Some Perturbation Problems in Ordinary Title : Differentia.l Equations AuthorInfo : By George R. SELL* AuthorInfo : (University of Minnesota) section : I. Introduction section : II. Preliminaries section : III. Perturbations of the Linear Equation section : IV. Perturbations of the Nonlinear Equation section : V. Comments on the Methodology section : References