| The constitutionalization of international law J Klabbers, A Peters, G Ulfstein OUP Oxford, 2011 | 741 | 2011 |
| Autonomous institutional arrangements in multilateral environmental agreements: A little-noticed phenomenon in international law RR Churchill, G Ulfstein American Journal of International Law 94 (4), 623-659, 2000 | 622 | 2000 |
| The Svalbard Treaty: from terra nullius to Norwegian sovereignty G Ulfstein (No Title), 1995 | 198 | 1995 |
| The legality of the NATO bombing in Libya G Ulfstein, HF Christiansen International & Comparative Law Quarterly 62 (1), 159-171, 2013 | 139 | 2013 |
| Maritime Delimitation in the Arctic: The Barents Sea Treaty T Henriksen, G Ulfstein Ocean Development & International Law 42 (1-2), 1-21, 2011 | 131 | 2011 |
| Marine management in disputed areas: the case of the Barents Sea R Churchill, G Ulfstein Routledge, 2005 | 123 | 2005 |
| Innføring i folkerett M Ruud, G Ulfstein Universitetsforl., 2002 | 104 | 2002 |
| The disputed maritime zones around Svalbard R Churchill, G Ulfstein Changes in the Arctic Environment and the Law of the Sea, 551-594, 2010 | 65 | 2010 |
| Individual complaints G Ulfstein UN Human Rights Treaty Bodies: Law and Legitimacy, 73-115, 2012 | 61 | 2012 |
| Legitimacy and international courts N Grossman, HG Cohen, A Follesdal, G Ulfstein Cambridge University Press, 2018 | 57* | 2018 |
| The Kyoto compliance system: Towards hard enforcement G Ulfstein, J Werksman Implementing the Climate Regime, 39-62, 2013 | 57 | 2013 |
| The international judiciary G Ulfstein The constitutionalization of international law 126, 142, 2009 | 55 | 2009 |
| Constituting Europe: the European Court of Human Rights in a national, European and global context A Føllesdal, B Peters, G Ulfstein Cambridge University Press, 2013 | 53 | 2013 |
| Implementing the climate regime: international compliance J Hovi, OS Stokke, G Ulfstein Routledge, 2013 | 52 | 2013 |
| Indigenous peoples' right to land G Ulfstein Max Planck Yearbook of United Nations Law Online 8 (1), xvii-47, 2004 | 47 | 2004 |
| Terrorism and the Use of Force G Ulfstein Security Dialogue 34 (2), 153-167, 2003 | 46 | 2003 |
| Innføring i folkerett, 5. utgave GUM Ruud Universitetsforlaget, 2011 | 39 | 2011 |
| Institutions and competences G Ulfstein The constitutionalization of international law, 45-80, 2009 | 38 | 2009 |
| The performance of international courts and tribunals T Squatrito, OR Young, A Follesdal, G Ulfstein Australian Year Book of International Law 37, 222, 2018 | 37 | 2018 |
| Do we need a world court of human rights? G Ulfstein Law at War: The Law as it was and the Law as it Should Be, 273-284, 2008 | 35 | 2008 |
