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« / » https://www.researchgate.net/publication/228634329_Public_Transport_in_Bielefeld_Germany_and_Berne_Switzerland_since_1950_A_comparative_analysis_of_efficiency_effectiveness_and_political_background/fulltext/000079010cf23f86393cefaf/Public-Transport-in-Bielefeld-Germany-and-Berne-Switzerland-since-1950-A-comparative-analysis-of-efficiency-effectiveness-and-political-background.pdf