Flexibility in International Dispute Settlement: Conciliation Revisited (co-autor con Christian Tomuschat), Leiden, Brill, 2020, 291p
The Institute of International Law’s Resolution on State Succession and State Responsibility: Introduction, Text and Commentaries (co-autor con Patrick Dumberry), Cambridge, Cambridge University Press, 2019, 178 p.
Research Handbook on Territorial Disputes in International Law (co-editor con Mamadou Hébié), Cheltenham, Edward Elgar Publ., 2018, 476p
Territoriality in International Law (ed.), Cheltenham (UK), Edward Elgar Publ, 2016, 704p.
Las Malvinas entre el Derecho y la Historia. Refutación del folleto británico ‘Más allá de la historia oficial. La verdadera historia de las Falklands/Malvinas’ (con Facundo Rodríguez), Buenos Aires, Editorial Universitaria de Buenos Aires (Eudeba), 2015, 304p
Mélanges en l’honneur du professeur Jean-Michel Jacquet, Le droit des rapports internationaux économiques et privés, Paris, LexisNexis, 2013, 450p. (co-editor con Dolores Bentolila).
Diplomatic and Judicial Means of Dispute Settlement, Leiden, M. Nijhoff, 2013, xv+337p. (co-editor con Laurence Boisson de Chazournes & Jorge Viñuales).
Perspectives of International Law in the 21st Century. Liber Amicorum Professor Christian Dominicé in Honour of His 80th Birthday, Leiden, M. Nijhoff, 2012, xxxi+470 págs. (co-editor con Robert Kolb & Djacoba Tehindrazanarivelo)
International Law and the Quest for its Implementation/Le droit international el la quête de sa mise en oeuvre : Liber Amicorum Vera Gowlland-Debbas (co-editor con Laurence Boisson de Chazournes), Leiden, M. Nijhoff, 2010, xviii+513 pp.
La promotion de la justice, des droits de l’homme et du règlement des conflits par le droit international : Liber Amicorum Lucius Caflisch (ed.), Leiden: Martinus Nijhoff, 2006, xxviii+1228 pp.
Secession. International Law Perspectives (ed.), Cambridge, Cambridge University Press, 2006, xxxvi+510 pp
State Practice Regarding State Immunities (co-ed. con Gerhard Hafner y Susan Breau), Leiden, M. Nijhoff y Consejo de Europa, 2006, xxviii+1100 pp
La pratique et le droit international, Société française pour le droit international, colloque de Genève (co-editor con Laurence Boisson de Chazournes y Gionata Buzzini), Paris, Pedone, 2004, 308 pp.
Possession contestée et souveraineté territoriale. Paris, P.U.F. (collection de l’Institut universitaire de hautes études internationales), 1997, xxv+582 pp. Premio Paul Guggenheim 1997