One of the three papers of the thesis can be co-authored. The student does not need to request permission to co-author this paper, but she/he must be its first and leading author. Upon finishing the dissertation, when the dissertation is submitted to the Academic Committee, the authors of the paper shall write, sign, and send a letter to the Academic Committee detailing their contributions to the article. In view of this letter, the Academic Committee may or may not authorize the inclusion of the paper in the thesis. If the paper has already been published, the PhD student must be listed as the first author. When the co-author is not a doctor, he or she shall renounce his or her right to include the piece in any future PhD thesis of his/her own.

The co-authorship of a second paper should be previously authorised by the Academic Committee through a letter addressed to the Academic Committee before the end of the third academic year. The letter requesting permission for a second co-authored paper should indicate the tasks performed by each author (specific contribution). This letter of co-authorship must be submitted with the signatures of all authors of the paper.