• "Are States Liable for the Conduct of their Instrumentalities? - Introductory Remarks," in State Entities in International Arbitration, IAI Series on International Arbitration No. 4, at 7 (E. Gaillard and J. Younan eds., Juris Publishing, 2008)

• "The First Site Visit of the International Court of Justice in Fulfillment of its Judicial Function," 92 Am. J. Int'l L. 133 (1998)(with S. Wordsworth)

• "The Special Agreement," in Liber Amoricum Judge Shigeru Oda 553 (N. Ando et al. eds., 2002)

• "Unity and Diversity in the Settlement of International Disputes – A comment," in Unity and Diversity in International Law (R. Hofmann, A. Zimmermann eds., forthcoming in 2005)

• "Defenses Based on Necessity Under Customary International Law and on Emergency Clauses in Bilateral Investment Treaties," in Building International Investment Law – The First 50 Years of ICSID 415 (M. Kinnear et al. eds., Kluwer, 2015)

• "Are States Liable for the Conduct of their Instrumentalities? - Introductory Remarks," in State Entities in International Arbitration, IAI Series on International Arbitration No. 4, at 7 (E. Gaillard and J. Younan eds., Juris Publishing, 2008)

• "Elettronica Sicula Case,” in Max Planck Encyclopedia of Public International Law (R. Wolfrum Gen. ed., OUP, on-line 2008)

• "Fisheries Jurisdiction Cases (United Kingdom of Great Britain and Northern Ireland v. Iceland)," in Max Planck Encyclopedia of Public International Law (R. Wolfrum Gen. ed., OUP, on-line 2008)

• "Frontier Dispute Case (Burkina Faso/Republic of Mali)," in Max Planck Encyclopedia of Public International Law (R. Wolfrum Gen. ed., OUP, on-line 2008)

• "Sovereignty over Certain Frontier Land Case (Belgium/Netherlands)," in Max Planck Encyclopedia of Public International Law (R. Wolfrum Gen. ed., OUP, on-line 2008)

• "Comment on the Unity and Diversity of International Law in the Settlement of International Disputes," in Unity and Diversity in International Law (R. Hofmann, A. Zimmermann eds., 2006)

• "The Special Agreement," in Liber Amicorum Judge Shigeru Oda 553 (N. Ando et al. eds., 2002)

• "The First Site Visit of the International Court of Justice in Fulfillment of its Judicial Function," 92 Am. J. Int'l L. 133 (1998) (with S. Wordsworth)