@Book{BVPB20140002351, title = "Katimatika", publisher = "Madrid : Saturnino Calleja", editor = "Saturnino Calleja", series = "(Cuentos de Calleja en colores. Quinta serie)", URL = "https://bvpb.mcu.es/es/consulta/registro.do?id=487792", year = "1924", }