@book{109154,
	author = {González Alvarez, Joaquín, 1924-},
	title = {El "Cántico cósmico", la entropía y el tiempo},
	year = {ene./mar. 2004},
	address = {La Habana},
	url = {http://casanchi.com/ref/cantico_cosmico01.pdf}
}