@inbook{fagnani1999-1,
	author="F. Fagnani and S. Zampieri",
	title="System Theory: Modelling Analysis and Control",
	year="1999",
	pages="55--62",
	chapter="Systems theory over finitely generated Abelian groups",
	isbn="0-7923-8618-3",
	publisher="Kluwer"
}