Artikel 53

1. The Convention shall enter into force six months after the date on which five States referred to in article 52, paragraph 1, have signed it without reservation of ratification, acceptance or approval or have deposited their instruments of ratification, acceptance, approval or accession.
2. After five States referred to in article 52, paragraph 1, have signed it without reservation of ratification, acceptance or approval, or have deposited their instruments of ratification, acceptance, approval or accession, this Convention shall enter into force for further Contracting Parties six months after the date of the deposit of their instruments of ratification, acceptance, approval or accession.
3. Any instrument of ratification, acceptance, approval or accession deposited after the entry into force of an amendment to this Convention shall be deemed to apply to this Convention as amended.
4. Any such instrument deposited after an amendment has been accepted but before it has entered into force shall be deemed to apply to this Convention as amended on the date when the amendment enters into force.