@Book{CYL20100020869, title = "Le\'{o}n", author = "Cr\'{e}mer, Victoriano, 1907-2009", publisher = "Madrid : Publicaciones espa\~{n}olas", editor = "Publicaciones espa\~{n}olas", series = "(Temas espa\~{n}oles ; 488)", URL = "https://bibliotecadigital.jcyl.es/es/consulta/registro.do?id=11738", year = "1968", }