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Brian D. Lepard, Customary International Law: A New Theory with Practical Applications, Cambridge, Cambridge University Press, 2010, xx + 419pp., ISBN-9780521191364, £70.00 (hb), ISBN-9780521138727, £38.00 (pb).

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Brian D. Lepard, Customary International Law: A New Theory with Practical Applications, Cambridge, Cambridge University Press, 2010, xx + 419pp., ISBN-9780521191364, £70.00 (hb), ISBN-9780521138727, £38.00 (pb).

Published online by Cambridge University Press:  06 May 2011

Aurel Sari
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BOOK REVIEWS
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Leiden Journal of International Law , Volume 24 , Issue 2 , June 2011 , pp. 531 - 535
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Copyright © Foundation of the Leiden Journal of International Law 2011

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References

1 J. Kammerhofer, ‘Uncertainty in the Formal Sources of International Law: Customary International Law and Some of Its Problems’, (2004) 15 EJIL 523, at 551.

2 M. Koskenniemi, From Apology to Utopia: The Structure of International Legal Argument (2005), 409.

3 In his famous article on instant custom, Bin Cheng suggested that ‘international customary law has in reality only one constitutive element, the opinio juris’; see Cheng, B., ‘United Nations Resolutions on Outer Space: “Instant” International Customary Law?’, (1965) 5 Indian Journal of International Law 23, at 36Google Scholar. Maurice Mendelson, by contrast, sees ‘no particular reason to insist on proof of the presence of opinio juris’ in clear-cut cases; see M. H. Mendelson, ‘The Formation of Customary International Law’, (1998) 272 RdC 155, at 292.

4 F. L. Kirgis, ‘Custom on a Sliding Scale’, (1987) 81 AJIL 146; for a more refined, but similar, approach, see A. E. Roberts, ‘Traditional and Modern Approaches to Customary International Law: A Reconciliation’, (2001) 95 AJIL 757.