1999, Part of book or chapter of book (Gijsel, P. de; Janssen, M.; Wenzel, H.-J. (ed.), Understanding European Cross-Border Labour Markets: Issues in Economic Cross-Border Relations, pp. 165-181)
1999, Article / Letter to editor (Welttrends, Zeitschrift für Internationale Politik und Vergleichende Studien, vol. Frühjahr, iss. 22, (1999), pp. 215-216)
1999, Part of book or chapter of book (Boekema, F.; Allaert, G. (ed.), Grensoverschijdende activiteiten in beweging. Grensregio's, onderzoek en beleid, pp. 127-139)
1998, Part of book or chapter of book (Glasbergen, P. (ed.), Co-operative Environmental Governance. Public-Private Agreements as a Policy Strategy, pp. 43-63)