paragraph 278 in volume 3, chapter 18, The Representation of the Parties

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The Court has by and large followed the practice of the Permanent Court¹ and no fundamental change was introduced following the revision of the Rules of Court in 1978. The agent is expected to be present in person (unless unavoidably prevented) at every public session of the Court in the contentious case for which he or she has been appointed - witness to the agent’s representative capacity; this may be relaxed in advisory cases, …