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Bergisch Gladbach, 1989
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Aachen: Mainz, 1987 ; Bergisch Gladbach: Bundesanst. für Strassenwesen, Bereich Unfallforschung, 1987
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German Federal Highway Research Institute (BASt): Electronic BASt Archive (ELBA), 1987-11-08
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German Federal Highway Research Institute (BASt): Electronic BASt Archive (ELBA), 2015-05-28
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German Federal Highway Research Institute (BASt): Electronic BASt Archive (ELBA), 2015-05-28