. . . For the purpose of this Convention, a “Regional Economic Integration Organisation" means any organisation which is constituted by sovereign States of a given region which has competence in respect of certain matters governed by this Convention and has been duly authorized to sign and to ratify, accept, approve or accede to this Convention. A reference to a “State Party" or “States Parties" in this Convention, otherwise than in paragraph 2 of Article 1, paragraph 1(b) of Article 3, paragraph (b) of Article 5, Articles 23, 33, 46 and paragraph (b) of Article 57, applies equally to a Regional Economic Integration Organisation. For the purpose of Article 24, the references to “a majority of the States Parties" and “one-third of the States Parties" shall not apply to a Regional Economic Integration Organisation.