Protocol on the accession of the Government of the Republic of Austria to the Agreement between the Governments of the Member States of the Benelux Economic Union, the Federal Republic of Germany and the French Republic on the gradual abolition of controls at their common borders, signed at Schengen on 14 June 1985, as amended by the Protocols of 27 November 1990, 25 June 1991 and 6 November 1992 on the accession of the Governments of the Italian Republic, the Kingdom of Spain and the Portuguese Republic and the Hellenic Republic, respectively