@article {2006,
	title = {Classification of stable time-optimal controls on 2-manifolds},
	journal = {J. Math. Sci. 135 (2006) 3109-3124},
	number = {SISSA;20/2004/M},
	year = {2006},
	doi = {10.1007/s10958-006-0148-0},
	url = {http://hdl.handle.net/1963/2196},
	author = {Ugo Boscain and Igor Nikolaev and Benedetto Piccoli}
}
