@article {2010,
	title = {Dynamics control by a time-varying feedback},
	journal = {Journal of Dynamical and Control Systems. Volume 16, Issue 2, April 2010, Pages :149-162},
	year = {2010},
	publisher = {SISSA},
	abstract = {We consider a smooth bracket generating control-affine system in R^d and show that any orientation preserving diffeomorphism of R^d can be approximated, in the very strong sense, by a diffeomorphism included in the flow generated by a time-varying feedback control which is polynomial with respect to the state variables and trigonometric-polynomial with respect to the time variable.},
	keywords = {Discrete-time dynamics},
	doi = {10.1007/s10883-010-9087-7},
	url = {http://hdl.handle.net/1963/6461},
	author = {Andrei A. Agrachev and Marco Caponigro}
}
@article {2009,
	title = {Controllability on the group of diffeomorphisms},
	journal = {Ann. Inst. H. Poincar{\'e} Anal. Non Lin{\'e}aire 26 (2009) 2503-2509},
	number = {SISSA;79/2008/M},
	year = {2009},
	abstract = {Given a compact manifold M, we prove that any bracket generating family of vector fields on M, which is invariant under multiplication by smooth functions, generates the connected component of identity of the group of diffeomorphisms of M.},
	doi = {10.1016/j.anihpc.2009.07.003},
	url = {http://hdl.handle.net/1963/3396},
	author = {Andrei A. Agrachev and Marco Caponigro}
}
