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Vienna Convention on the Law of Treaties
PART-II: CONCLUSION AND ENTRY INTO FORCE OF TREATIES
SECTION-1: CONCLUSION OF TREATIES
ARTICLE 16: Exchange or deposit of instruments of ratification, acceptance, approval or accession
Unless the treaty otherwise provides, instruments of ratification, acceptance, approval or accession establish the consent of a State to be bound by a treaty upon:
(a) their exchange between the contracting States;
(b) their deposit with the depositary; or
(c) their notification to the contracting States or to the depositary, if so agreed.