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Dual-mode buses in the city of Essen,West Germany |
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| Authors: | Jochem Boegner Ulrich Koch |
| Affiliation: | 1. Jochem Boegner is with Essener Verkehrs-AG, Essen, West Germany.;2. Ulrich Koch is with the firm of SNV Studiengesellschaft Nahverkehr mbH, Hamburg, West Germany. |
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