paragraph 158 in volume 2, chapter 9, Jurisdiction and Admissibility: General Concepts
It is implicit from the foregoing that once a State has given its consent to the referral of a dispute to the Court, it may not withdraw that consent during the pendency of the proceedings for which it was given if another State has acted on the basis of that consent and has instituted proceedings before the Court. The Anglo-Iranian Oil Co. case provides a most striking demonstration of this rule. Here, after the order of 5 July 1951 indicating interim measures of …