@book{4576,
	author = {Shapiro, Gilbert. and Civera Aguilar J.M},
	title = {Física sin matemáticas /},
	publisher = {Alhambra,},
	year = {1968.},
	series = {Exedra 30.},
	address = {Madrid :},
	edition = {1a. ed.},
	note = {Título original : The geological aspects of the origin of life on earth}
}