Singular perturbations of two-point boundary problems for systems of ordinary differential equations

The Boundary Problems and Developments Associated with a System of Ordinary Linear Differential Equations of the First Order

1923 • 118 citations

A boundary value problem for a nonlinear differential equation with a small parameter

1952 • 69 citations

Singular Perturbations of Non-Linear Systems of Differential Equations and an Associated Boundary Layer Equation

1954 • 63 citations

On the Asymptotic Solution of Boundary Value Problems for Ordinary Differential Equations Containing a Parameter

1944 • 46 citations

VI. Asymptotic Expansions of Solutions of Systems of Ordinary Linear Differential Equations Containing a Parameter

1953 • 39 citations

Asymptotic Distribution of Zeros for Certain Exponential Sums

1944 • 12 citations

A Boundary Value Problem for a Nonlinear Differential Equation with a Small Parameter

1952 • 7 citations