@book{101509,
	author = {Olivera Serrano, César,},
	title = {Castilla y Portugal en la Edad Media :},
	publisher = {Dykinson,},
	year = {2023.},
	series = {Extravagantes,},
	address = {Madrid :},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/131236/}
}