Periodic solutions of differential systems, Galerkin's procedure and the method of averaging

Asymptotic Methods in the Theory of Nonlinear Oscillations

1961 • 3,289 citations

Asymptotic methods in the theory of non-linear oscillations

1963 • 1,005 citations

Galerkin's procedure for nonlinear periodic systems

1965 • 326 citations

Numerical computation of nonlinear forced oscillations by Galerkin's procedure

1966 • 165 citations