@book{1527,
	author = {Thiel, Christian.},
	title = {Sentido y referencia en la lógica de Gottlob Frege},
	publisher = {Tecnos},
	year = {1972.},
	address = {Madrid},
	note = {Translations of : Sinn und Bedeutung in der Logik Gottlob Freges.}
}