7 – Not all authorities, however, agree on the extent to which Article 18 constitutes simply a codification, rather than a development, of customary international law: see, for example, Sinclair, I., The Vienna Convention on the Law of Treaties, Manchester University Press, 1973, p. 22; for an account of some of the formulations of the customary rule, differing from that in the Vienna Convention, see also Klabbers, J., ‘How to defeat a treaty’s object and purpose pending entry into force: toward manifest intent’, 34 Vanderbilt Journal of Transnational Law, p.
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