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2. Transport Economics;Button,2010
3. Verkehrswirtschaftlicher und Ökologischer Vergleich der Verkehrsträger Straße, Schiene und Wasserstraße,2007
4. Handbook on the External Costs of Transport;van Essen,2019
5. Freight Transport Statistics—Modal Splithttps://ec.europa.eu/eurostat/statistics-explained/index.php/Freight_transport_statistics_-_modal_split#Modal_split_in_the_EU