The Contracting Parties undertake, subject to the obligations resulting from their accession to the Geneva Convention relating to the Status of Refugees of 28 July 1951, as amended by the New York Protocol of 31 January 1967, to incorporate the following rules into their national law:
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If aliens are refused entry into the territory of one of the Contracting Parties, the carrier which brought them to the external border by air, sea or land shall be obliged immediately to assume responsibility for them again. At the request of the border surveillance authorities the carrier shall be obliged to return the aliens to the third State from which they were transported or to the third State which issued the travel document on which they travelled or to any other third State to which they are certain to be admitted.
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The carrier shall be obliged to take all the necessary measures to ensure that an alien carried by air or sea is in possession of the travel documents required for entry into the territories of the Contracting Parties.