@book{upm10937,
           title = {El arte espa{\~n}ol en el sello},
            year = {2003},
         address = {Madrid},
       publisher = {Correos},
          author = {Navascu{\'e}s Palacio, Pedro},
            isbn = {84-9785-042-4},
             url = {https://oa.upm.es/10937/}
}