Perturbations of discontinuous solutions of non-linear systems of differential equations

Singular perturbations of non-linear oscillations

1946 • 85 citations

Über das Verhalten der Integrale von λy"+ƒ(x, y, y, 'λ)=0 fur λ→0

1939 • 12 citations

Perturbations of Discontinuous Solutions of Non-Linear Systems of Differential Equations

1947 • 12 citations