@inbook{p.2006,
	author="P. Santesso and M.E. Valcher",
	title="Positive Systems",
	year="2006",
	pages="185--192",
	volume="341",
	address="NEW YORK -- USA",
	chapter="An algebraic approach to the structural properties of switched positive systems",
	isbn="ISI:000239627400024",
	publisher="Springer Verlag"
}