@book{87840,
	author = {García Herrera, Nicolás,},
	title = {640 ejercicios y problemas de matemáticas con soluciones /},
	publisher = {Libros ENCASA,},
	year = {[2014]},
	series = {Cuadernos electrónicos},
	address = {Málaga, España :},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/88109/}
}