What can be brought to a referendum?

Constitution (2005)

http://parliament.iq/manshurat/dastoreng.pdf

Article 126: First: The President of the Republic and the Council of the Ministers collectively, or one-fifth of the Council of Representatives members, may propose to amend the Constitution. Second: The fundamental principles mentioned in Section One and the rights and liberties mentioned in Section Two of the Constitution may not be amended except after two successive electoral terms, with the approval of two-thirds of the members of the Council of Representatives, the approval of the people in a general referendum, and the ratification by the President of the Republic within seven days.Article 142: [?]Third: The articles amended by the Council of Representatives pursuant to item ?Second? of this Article shall be presented to the people for voting on them in a referendum within a period not exceeding two months from the date of their approval by the Council of Representatives.