Vietze, C. 2011. Social Tariff Concessions and the Price Elasticity of Demand of Local Public Transport System in a Medium Sized Urban Area. Raumforschung und Raumordnung | Spatial Research and Planning. 69, 5 (Oct. 2011), 319–331. DOI:https://doi.org/10.1007/s13147-011-0116-0.