Reduction of the order of a linear ordinary differential equation containing a small parameter

Simplification of a system of linear ordinary differential equations about a singular point.

1962 • 47 citations

Asymptotic solutions of a system of linear ordinary differential equations containing a parameter.

1962 • 43 citations

Sur reduction analytique d'un systeme d'equations differentielles ordinaires lineaires contenant un parametre

1958 • 38 citations

On certain reduction theorems for systems of differential equations which contain a turning point

1961 • 10 citations

Formal solutions of a linear ordinary differential equation of the nth order at a turning point.

1962 • 9 citations