31 citations · 60 across the 4 of their papers we have counts for
1 paper · 2 filters
R. H. Cushman, Holger R. Dullin, Heinz Hanßmann +1
On the linear level elliptic equilibria of Hamiltonian systems are mere superpositions of harmonic oscillators. Non-linear terms can produce instability, if the ratio of frequencie…