@book {
	author = {Gáspár, Péter and Szabó, Zoltán and Bokor, József},
	title = {Discrete Feedback Systems 2.},
	year = {2019},
	publisher = {Akadémiai Kiadó},
	isbn = {978 963 454 373 2},
	doi = {10.1556/9789634543732},
	URL = {https://mersz.hu/kiadvany/504}
}