Unique normal forms for vector fields and Hamiltonians

On the Integrals of Canonical Systems

Carl Ludwig Siegel · Annals of Mathematics · 1941 · 124 citations

Resolvent Kernel, Integrable Probability, Canonical Systems +2

On averaging, reduction, and symmetry in hamiltonian systems

Richard C. Churchill, Martin Kummer, David L. Rod · Journal of Differential Equations · 1983 · 118 citations

Hamiltonian Theory, Hamiltonian Systems, Hamiltonian System

On resonant non linearly coupled oscillators with two equal frequencies

Martin Kummer · Communications in Mathematical Physics · 1976 · 72 citations

Nonlinear Circuit, Equal Frequencies, Oscillation Theory +3

How to avoid « secular » terms in classical and quantum mechanics

Martin Kummer · ˜Il œNuovo cimento della Società italiana di fisica. B/˜Il œNuovo cimento B · 1971 · 49 citations

Uniqueness and non-uniqueness of normal forms for vector fields

Alberto Baider, Richard Churchill · Proceedings of the Royal Society of Edinburgh Section A Mathematics · 1988 · 32 citations

Hamiltonian Theory, Normal Forms, Geometric Partial Differential Equation +6