@book{23903,
	author = {Barrera Cristancho, Pedro},
	title = {Secure data service S.A.S /},
	publisher = {Corporación Unificada Nacional de Educación Superior,},
	year = {2017.},
	address = {Bogotá (Colombia) :},
	url = {https://drive.google.com/file/d/1G9ilOoQjdV3JFbVVVBHLQqK9NglLzu5v/view?usp=share_link}
}