@book{257391,
	author = {Hellinger, Bert, and Gómez Pedra, Sylvia,},
	title = {El centro se distingue por su levedad /},
	publisher = {Herder,},
	year = {2013.},
	address = {Barcelona :},
	url = {https://www.digitaliapublishing.com/a/61110/}
}