2005, Article in monograph or in proceedings (Acker, Van V.; Witlox, F. (ed.), De Belgische Geografendagen: Mobiliteit, Maatschappij en Milieu in Kaart Gebracht, pp. 73-78)
2004, Part of book or chapter of book (C.A. Brebbia & L.C. Wadhwa (ed.), Urban Transport X: Urban Transport and the Environment in the 21st Century, pp. 53-62)
2004, Article in monograph or in proceedings (Innovatie: van inspiratie naar realisatie? Colloquium Vervoersplanologisch Speurwerk Deel 2 - 2004, pp. 411-429)
2004, Article in monograph or in proceedings (Bovy, P. (ed.), A World of Transport, Infrastructure and Logistics. Proc.Suppl. 8th TRAIL Congress, pp. 1-17)