J. Roels

发表

Families of periodic solutions near a Hamiltonian equilibrium when the ratio of two eigenvalues is 3

J. Roels, 1971 .

An extension to resonant cases of Liapunov's theorem concerning the periodic solutions near a Hamiltonian equilibrium

J. Roels, 1971 .

Equivalence for lie transforms

J. Henrard, J. Roels, 1974 .

Central forces depending on the distance only. Case where all the bounded orbits are periodic

J. Roels, C. Aerts, 1988 .

Functions Whose Poisson Brackets Are Constants

A. Weinstein, J. Roels, 1971 .