@article {611,
	title = {On the Hamiltonian structure of Ermakov systems},
	journal = {J. Phys. A: Math. Gen},
	volume = {29},
	year = {1996},
	pages = {4083},
	attachments = {https://professor.ufrgs.br/sites/default/files/fernando-haas/files/hamiltonian_structure.pdf},
	author = {F. Haas and J. Goedert}
}
