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ARTICLE-2: Use of terms     [go to this ARTICLE]
... (a) “treaty” means an international agreement concluded between States in written form and governed by international law, whether embodied in a single instrument or in two or more related instruments and whatever its particular designation; ...


ARTICLE-3: International agreements not within the scope of the present Convention     [go to this ARTICLE]
... The fact that the present Convention does not apply to international agreements concluded between States and other subjects of international law or between such other subjects of international law, or to international agreements not in written form, shall not affect: ...


ARTICLE-23: Procedure regarding reservations     [go to this ARTICLE]
... 1. A reservation, an express acceptance of a reservation and an objection to a reservation must be formulated in writing and communicated to the contracting States and other States entitled to become parties to the treaty. ...
... 4. The withdrawal of a reservation or of an objection to a reservation must be formulated in writing. ...


ARTICLE-35: Treaties providing for obligations for third States     [go to this ARTICLE]
... An obligation arises for a third State from a provision of a treaty if the parties to the treaty intend the provision to be the means of establishing the obligation and the third State expressly accepts that obligation in writing. ...


ARTICLE-66: Procedures for judicial settlement, arbitration and conciliation     [go to this ARTICLE]
... (a) any one of the parties to a dispute concerning the application or the interpretation of articles 53 or 64 may, by a written application, submit it to the International Court of Justice for a decision unless the parties by common consent agree to submit the dispute to arbitration; ...


ARTICLE-67: Instruments for declaring invalid, terminating, withdrawing from or suspending the operation of a treaty     [go to this ARTICLE]
... 1. The notification provided for under article 65 paragraph 1 must be made in writing. ...