@Book{BVMC:1159857, author = {Halffter, Manuel}, title = {Original mecanografiado de Halffter, Manuel a Mr. Silverberg ; Mrs. Silverberg. 1972-10-31}, url = {https://www.cervantesvirtual.com/obra/original-mecanografiado-de-halffter-manuel-a-mr-silverberg-mrs-silverberg-1972-10-31-1159857} }