@book{90,
	author = {Nelson, David L. and Cox, Michael M.},
	title = {Lehninger. },
	publisher = {Omega;},
	year = {2001.},
	address = {Barcelona: },
	edition = {3a ed.},
	note = {Nelson, D. L. y Cox, M. M. (2001). Lehninger. Principios de Bioquímica. (3a ed.). Barcelona : Omega.}
}