@book{136,
	author = {Bajo Arenas, J. M.},
	title = {Ultrasonografía Obstétrica /  },
	publisher = {Marbán;},
	year = {2000.},
	address = {Madrid: },
	edition = {2a ed.},
	note = {Bajo Arenas, J. M. (2000). Ultrasonografía Obstetrica. (2a ed.). Madrid : Marbán.}
}