@article {2001,
	title = {Controllability for discrete systems with a finite control set},
	journal = {Math. Control Signals Systems 14 (2001) 173-193},
	number = {SISSA;148/97/M},
	year = {2001},
	publisher = {Springer},
	doi = {10.1007/PL00009881},
	url = {http://hdl.handle.net/1963/3114},
	author = {Yacine Chitour and Benedetto Piccoli}
}
