@Issue{NUM00004053894, title = "La Esfera : ilustraci\'{o}n mundial: A\~{n}o XV N\'{u}mero 737 - 1928 febrero 18", publisher = "[S.l. : s.n.]", editor = "s.n.]", URL = "https://prensahistorica.mcu.es/es/consulta/registro.do?id=10004053894", year = "1928", }