paragraph 308 in volume 3, chapter 20, The Written Proceedings and Related Matters
The common method by which otherwise undocumented events are described to the Court is by affidavit or declaration sworn or confirmed in accordance with the provisions of the national law of the deponent or of the party deposing the affidavit. The affidavit or declaration will be annexed to the documents of the written pleadings or introduced later in accordance with the terms of Article 56 (formerly 48) of th…