(1) Proposals for the amendment of Articles 7, 8, 9 and of the present Article may be initiated by any country of the Special Union or by the Director General. Such proposals shall be communicated by the Director General to the countries of the Special Union at least six months in advance of their consideration by the Assembly.
(2) Amendments to the Articles referred to in paragraph (1) shall be adopted by the Assembly. Adoption shall require three fourths of the votes cast, provided that any amendment to Article 7 and to the present paragraph shall require four-fifths of the votes cast.
(a) Any amendment to the Articles referred to in paragraph (1) shall enter into force one month after written notifications of acceptance, effected in accordance with their respective constitutional processes, have been received by the Director General from three-fourths of the countries members of the Special Union at the time the amendment was adopted.
(b) Any amendment to the said Articles thus accepted shall bind all the countries which are members of the Special Union at the time the amendment enters into force, provided that any amendment increasing the financial obligations of countries of the Special Union shall bind only those countries which have notified their acceptance of such amendment.
(c) Any amendment accepted in accordance with the provisions of subparagraph (a) shall bind all countries which become members of the Special Union after the date on which the amendment entered into force in accordance with the provisions of subparagraph (a).