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... Noting that the principles of free consent and of good faith and the pacta sunt servanda rule are universally recognized, ...
... Affirming that the rules of customary international law will continue to govern questions not regulated by the provisions of the present Convention, ...


ARTICLE-3: International agreements not within the scope of the present Convention     [go to this ARTICLE]
... (b) the application to them of any of the rules set forth in the present Convention to which they would be subject under international law independently of the Convention; ...


ARTICLE-4: Non-retroactivity of the present Convention     [go to this ARTICLE]
... Without prejudice to the application of any rules set forth in the present Convention to which treaties would be subject under international law independently of the Convention, the Convention applies only to treaties which are concluded by States after the entry into force of the present Convention with regard to such States. ...


ARTICLE-5: Treaties constituting international organizations and treaties adopted within an international organization     [go to this ARTICLE]
... The present Convention applies to any treaty which is the constituent instrument of an international organization and to any treaty adopted within an international organization without prejudice to any relevant rules of the organization. ...


ARTICLE-9: Adoption of the text     [go to this ARTICLE]
... 1. The adoption of the text of a treaty takes place by the consent of all the States participating in its drawing up except as provided in paragraph 2.
2. The adoption of the text of a treaty at an international conference takes place by the vote of two-thirds of the States present and voting, unless by the same majority they shall decide to apply a different rule. ...


ARTICLE-27: Internal law and observance of treaties     [go to this ARTICLE]
... A party may not invoke the provisions of its internal law as justification for its failure to perform a treaty. This rule is without prejudice to article 46. ...


ARTICLE-30: Application of successive treaties relating to the same subject-matter     [go to this ARTICLE]
... (a) as between States parties to both treaties the same rule applies as in paragraph 3; ...


ARTICLE-31: General rule of interpretation     [go to this ARTICLE]
... General rule of interpretation ...
... (c) any relevant rules of international law applicable in the relations between the parties. ...


ARTICLE-34: General rule regarding third States     [go to this ARTICLE]
... General rule regarding third States ...


ARTICLE-38: Rules in a treaty becoming binding on third States through international custom     [go to this ARTICLE]
... Rules in a treaty becoming binding on third States through international custom ...
... Nothing in articles 34 to 37 precludes a rule set forth in a treaty from becoming binding upon a third State as a customary rule of international law, recognized as such. ...
... Nothing in articles 34 to 37 precludes a rule set forth in a treaty from becoming binding upon a third State as a customary rule of international law, recognized as such. ...


ARTICLE-39: General rule regarding the amendment of treaties     [go to this ARTICLE]
... General rule regarding the amendment of treaties ...
... A treaty may be amended by agreement between the parties. The rules laid down in Part II apply to such an agreement except in so far as the treaty may otherwise provide. ...


ARTICLE-42: Validity and continuance in force of treaties     [go to this ARTICLE]
... 2. The termination of a treaty, its denunciation or the withdrawal of a party, may take place only as a result of the application of the provisions of the treaty or of the present Convention. The same rule applies to suspension of the operation of a treaty. ...


ARTICLE-46: Provisions of internal law regarding competence to conclude treaties     [go to this ARTICLE]
... 1. A State may not invoke the fact that its consent to be bound by a treaty has been expressed in violation of a provision of its internal law regarding competence to conclude treaties as invalidating its consent unless that violation was manifest and concerned a rule of its internal law of fundamental importance. ...


ARTICLE-69: Consequences of the invalidity of a treaty     [go to this ARTICLE]
... 4. In the case of the invalidity of a particular State's consent to be bound by a multilateral treaty, the foregoing rules apply in the relations between that State and the parties to the treaty. ...


ARTICLE-79: Correction of errors in texts or in certified copies of treaties     [go to this ARTICLE]
... 3. The rules in paragraphs 1 and 2 apply also where the text has been authenticated in two or more languages and it appears that there is a lack of concordance which the signatory States and the contracting States agree should be corrected. ...