13 



Contracting Parties participating in the meetings referred to in para- 

 graph 1 of the present Article. 



4. The measures referred to in paragraph 1 of this Article shall 

 become effective when approved by all the Contracting Parties whose 

 representatives were entitled to participate in the meetings held to 

 consider those measures. 



5. Any or all of the rights established in the present Treaty may 

 be exercised as from the date of entry into force of the Treaty whether 

 or not any measures facilitating the exercise of such rights have been 

 proposed, considered or approved as provided in this Article. 



Article X 



Each of the Contracting Parties undertakes to exert appropriate 

 efforts, consistent with the Charter of the United Nations, to the end 

 that no one engages in any activity in Antarctica contrary to the 

 principles or purposes of the present Treaty. 



Article XI 



1. If any dispute arises between two or more of the Contracting 

 Parties concerning the interpretation or application of the present 

 Treaty, those Contracting Parties shall consult amon^ themselves 

 with a view to having the dispute resolved by negotiation, inquiry, 

 mediation, conciliation, arbitration, judicial settlement or other peace- 

 ful means of their own choice. 



2. Any dispute of this character not so resolved shall, with the 

 consent, in each case, of all parties to the dispute, be referred to the 

 International Court of Justice for settlement; but failure to reach 

 agreement on reference to the International Court shall not absolve 

 parties to the dispute from the responsibility of continuing to seek 

 to resolve it by any of the various peaceful means referred to in 

 paragraph 1 of this Article. 



Article XII 



1. (a) The present Treaty may be modified or amended at any 

 time by unanimous agreement of the Contracting Parties whose rep- 

 resentatives are entitled to participate in the meetings provided for 

 under Article IX. Any such modification or amendment shall enter 

 into force when the depositary Government has received notice from 

 all such Contracting Parties that they have ratified it. 



(b) Such modification or amendment shall thereafter enter into 

 force as to any other Contracting Party when notice of ratification 

 by it has been received by the depositary Government. Any such 

 Contracting Party from which no notice of ratification is received 

 within a period of two years from the date of entry into force of the 

 modification or amendment in accordance with the provisions of sub- 

 paragraph 1(a) of this Article shall be deemed to have withdrawn 

 from the present Treaty on the date of the expiration of such period. 



2. (a) If after the expiration of thirty years from the date of 

 entry into force of the present Treaty, any of the Contracting Parties 

 whose representatives are entitled to participate in the meetings pro- 



