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Friedrich, H., Liedtke, G. (2007): Demand Modeling for Microscopic Models in Freight Transport – Modeling the Splitting of the Flow of Goods with Total Logistic Costs. Proceedings of: WCTRS Conference on Transportation Research 2007. 24.-28.06.2007, Berkley, USA.
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Friedrich, H., Liedtke, G., Spahn, M. (2007): Die Relation zwischen Wirtschaftsakteuren als zukünftige Bezugsgröße für mikroskopische Güterverkehrsmodelle. Proceedings of: Wirtschaftsverkehr 2007. 18.-19.04.2007, Dortmund.
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Friedrich, H., Liedtke, G., Carillo, D. (2007): Evaluation of intermodal transportation alternatives with the Total Logistic Cost (TLC) approach. Proceedings of: Intermodal Transport. 10.-12.05.2007, Chios Greece.
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Liedtke, G., Friedrich, H. (2008): Abbildung Logistischer Meso-Strukturen in Güterverkehrsmodellen. Proceedings of: Netzwerkoptimierung. 6.–7. 03.2008, Magdeburg.
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Friedrich, H., Liedtke, G. (2009): Consideration of Logistics for Policy Analysis with Freight Transport Models. Proceedings of: Infraday. 9. -10.10.2009, Berlin.
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Friedrich, H. (2010): Simulation of logistic structures in food retailing to estimate demand for freight transportation. Proceedings of: WCTRS Conference on Transportation Research 2010. 11.-15.07.2010, Lissabon, Portugal.
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Liedtke, G., Friedrich, H., Jochem, P., Keultjes, D., Schröder, S. (2010): "Estimation of the benefits of shippers from a multi-modal transport network”, Paper zur WCTRS Conference on Transportation Research 2010, 11-15 Juli 2010, Lissabon, Portugal.