Artikel XX

a. The present Convention shall remain open for signature or for accession, by those Governments which become parties to it, in accordance with the provisions of Article III, in the following circumstances:
1) by signature without reservation as to ratification, acceptance or approval;
2) by signature followed by ratification, acceptance or approval;
3) by accession.
b. Instruments of ratification, acceptance or approval, or of accession, shall be deposited with the French Government. The depositary shall inform all Member Governments of the date on which each has signed or deposited an instrument.