@article {2011,
	title = {Generalized Ricci Curvature Bounds for Three Dimensional Contact Subriemannian manifolds},
	number = {arXiv:0903.2550;},
	year = {2011},
	note = {This is a revised extended version that contains new results.},
	publisher = {SISSA},
	url = {http://hdl.handle.net/1963/6507},
	author = {Andrei A. Agrachev and Paul Lee}
}
