@book{144115,
	author = {Pérez Milanés, Lorenzo. and Lefebre Navarro, Jorge. and e-libro, Corp.},
	title = {Las variables en las investigaciones médicas},
	publisher = {[El Cid Editor | apuntes],},
	year = {[2009]},
	address = {[Santa Fe, Argentina] :},
	url = {https://elibro.net/ereader/politecnicointernacional/28358}
}