Can't Select gti trough to do SELECT DISTINCT GTH1.idArticulo, A.titulo, A.anho, A.nombCongRev, AG1.nick, GTH1.orden, A.fichero, A.volumen, A.numero, A.paginas, A.bibPublic FROM gtiHaEscrito GTH1, gtiHaEscrito GTH2, articulos A, autoresGti AG1, autoresGti AG2 WHERE GTH1.idArticulo = A.idArticulo AND GTH2.idArticulo = A.idArticulo AND AG1.idAutor = GTH1.idAutor AND AG2.idAutor = GTH2.idAutor AND AG2.gti = 1 AND AG2.idAutor = 19 ORDER BY A.anho DESC,GTH1.idArticulo DESC,GTH1.orden