@book{76793,
	author = {Vallejo, César, and Córdova Huamán, Washington,},
	title = {El tungsteno :},
	publisher = {Pakarina Ediciones :},
	year = {[2015]},
	address = {Lima :},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/58714/}
}