SIPRI Yearbook 1999: Armaments, Disarmament and International Security (Oxford University Press: Oxford, 1999) [With Elisabeth M. French and Natalie Pauwels]
Contemporary Security Policy, vol. 20, no. 1 (April 1999) [With Elisabeth M. French]
SIPRI Yearbook 1998: Armaments, Disarmament and International Security (Oxford University Press: Oxford, 1998) [With John Hart]
SIPRI Yearbook 1998: Armaments, Disarmament and International Security (Oxford University Press: Oxford, 1998) [with Ian Anthony]
Paper prepared for the Regional Workshop on the Coordination of the Assistance under Article X of the Chemical Weapons Convention, organized by the Organisation for the Prohibition of Chemical Weapons, Sofia, Bulgaria, 28–30 September 1998 (SIPRI, Stockholm, October 1998).
SIPRI Factsheet, October 1998 [With Gunilla Flodén, Elisabeth French, Peter Jones, and Natalie Pauwels]
The destruction of old chemical munitions in Belgium, in Thomas Stock and Karlheinz Lohs (eds.), The Challenge of Old Chemical Munitions and Toxic Armament Wastes,
SIPRI Chemical & Biological Warfare Studies No. 16 (Oxford University Press: Oxford, 1997).
SIPRI Fact Sheet, Stockholm International Peace research Institute, April 1997 [With Susanna Eckstein and John Hart]
(The Chemical Weapons Convention: Challenges for a disarmament regime), Veiligheid en Strategie, no. 56. Koninklijk Hoger Instituut voor Defensie, Brussels, December 1997
Note prepared for the Regional Seminar on the Chemical Weapons Convention and Its National Implementation, organized by the Preparatory Commission (PrepCom) of the Organisation for the Prohibition of Chemical Weapons, Gozo Island, Malta, 12-14 June 1996 (Centrum voor Polemologie, Vrije Universiteit Brussel, June 1996)
Address to the SIPRI 30th Anniversary Conference, The Future International Security Agenda, Stockholm, 3-6 October 1996
SIPRI statement to the 4th Review Conference of the Biological and Toxin Weapons Convention, Geneva, 27 November 1996
The Prohibition of ‘Use’ under the BTWC: Backgrounder on relevant developments during the negotiations, 1969-1972,
SIPRI Backgrounder for the 4th Review Conference of the Parties to the BTWC prepared in response to the request of representatives of several States Parties following the proposal by the Islamic Republic of Iran to amend the title and Article 1 of the BTWC, December 1996 [with Susanna Eckstein]
POLE-PAPERS, vol. 2, no. 1 (Centrum voor Polemologie, Vrije Universiteit Brussel, 1995)
Proceedings of the 3rd Annual Conference on Chemical Warfare. Vrije Universiteit Brussel, 29-30 November 1991 (Free University of Brussels: Brussels, 1995)
Revue Belge de Droit International (1993/1)
Vredesonderzoek, no. 7, Centre For Polemology, Free University Of Brussels (December 1992)
Proceedings of the Second Annual Conference on Chemical Warfare, Vrije Universiteit Brussel, 16 March 1990 (Free University of Brussels: Brussels, 1991)
Bulletin of Peace Proposals, Vol. 21, no. 1 (March 1990)
Vredesonderzoek, no. 4, Centre For Polemology, Free University Of Brussels (March 1990)
[Chemical weapons: Is threat more effective than use?], Bijdragen tot de Vierde Marktdag Internationale Betrekkingen en Vredesvraagstukken, 14 december 1990, Stichting Interuniversitair Instituut voor Sociaal-Wetenschappelijk Onderzoek (SISWO), Amsterdam, 1990.