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Advancement of the Blue Angel to Increase Awareness Among Consumers - a Positioning Strategy 智库出版物
2014
作者:  Hildebrandt, Paul Werner;  Hameister, Julia;  Scholl, Gerd;  Gossen, Maike
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Opportunities for small and medium-sized service providers in the environmental sector in China 智库出版物
2009
作者:  Konrad, Wilfried;  Paul, Gerd
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