Media type: E-Article Title: Article 31 of the Vienna Conventions on the Law of Treaties and International Investment Law Contributor: Ascensio, Hervé imprint: Oxford University Press (OUP), 2016 Published in: ICSID Review Language: English DOI: 10.1093/icsidreview/siw008 ISSN: 0258-3690; 2049-1999 Keywords: Law ; Finance Origination: Footnote: