3.
Should the office of Director-General become vacant [
during the above-mentioned term of office,
]
prior to the expiry of his term of office
, the Conference shall, either at the next regular' session or at a special session convened in accordance withArticle III, paragraph 6 of this Constitution, appoint a Director-General in accordance with the provisions of paragraphs 1 and 2 of this Article. However, the duration of the term of office of the Director-General appointed at a special session shall expire at the end of the year of the third regular session of the Conference following the date of his appointment.