@inbook {606,
	title = {Lie symmetries of generalized Ermakov systems},
	booktitle = {Lecture Notes in Physics (v. 518) - Dynamical Systems, Plasmas and Gravitation},
	year = {1999},
	publisher = {Springer-Verlag},
	organization = {Springer-Verlag},
	address = {Heidelberg },
	attachments = {https://professor.ufrgs.br/sites/default/files/fernando-haas/files/lie_ermakov.pdf},
	author = {F. Haas and J. Goedert}
}
