Onno Langhorst
- (2007): Monitoring as a tool for the "Observational Method". Presented at: IABSE Symposium: Improving Infrastructure Worldwide, Weimar, Germany, 19-21 September 2007.
- Settlement and foundation of the HSL South. Presented at: IABSE Symposium: Structures for High-Speed Railway Transportation, Antwerp, Belgium, 27-29 August 2003. (2003):