Artikel IX

The Secretary-General shall convene a conference of the Contracting Governments for revision or amendment of the present Convention at the request of not less than one third of the Contracting Governments. Any revision or amendments shall be adopted by a two-thirds majority vote of the Conference and then certified and communicated by the Secretary-General to all Contracting Governments for their acceptance. One year after the acceptance of the revision or amendments by two thirds of the Contracting Governments, each revision or amendment shall enter into force for all Contracting Governments except those, which, before its entry into force, make a declaration that they do not accept the revision or amendment. The Conference may by a two-thirds majority vote determine at the time of its adoption that a revision or amendment is of such a nature that any Contracting Government which has made such a declaration and which does not accept the revision or amendment within a period of one year after the revision or amendment enters into force shall, upon the expiration of this period, cease to be a Party to the Convention.