@book{63214,
	author = {Beltran López, Virgilio and Braun, Eliezer., },
	title = {Principios de física  },
	publisher = {:Trillas},
	year = {, 1990},
	address = {México },
	edition = {2a. edición},
	note = {Incluye analítico (p. 353-356)}
}