@article {2012,
	title = {Introduction to Riemannian and sub-Riemannian geometry},
	number = {SISSA;09/2012/M},
	year = {2012},
	institution = {SISSA},
	url = {http://hdl.handle.net/1963/5877},
	author = {Andrei A. Agrachev and Davide Barilari and Ugo Boscain}
}
