@article {593,
	title = {Generalized Hamiltonian structures for Ermakov systems},
	journal = {J. Phys. A: Math. Gen },
	volume = {35},
	year = {2002},
	pages = {2925},
	attachments = {https://professor.ufrgs.br/sites/default/files/fernando-haas/files/generalized_hamiltonian.pdf},
	author = {F. Haas}
}
