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              Jörgens, Helge (2003): The diffusion of new envi- ronmental policy instruments. In: Eur J Political Res 42 (4), S. 569-600. DOI: 10.1111/1475-6765.00096
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              Tews, K., Busch, P-O., & Jörgens, H. (2003). The diffusion of new environmental policy instruments. European Journal of Political Research. 42, 569-600.
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              Tews, K., Busch, P.-O. & Jörgens, H. (2003). The diffusion of new environmental policy instruments. European Journal of Political Research 42(4): 569-600.
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              Tews, Kerstin, Per-Olof Busch und Helge Jörgens. 2003. The diffusion of new environmental policy instruments. European Journal of Political Research 42: 569-600.
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              Tews, Kerstin/Busch, Per-Olof/Jörgens, Helge 2003: The diffusion of new environmental policy instruments, in: European Journal of Political Research 42: 2, 569-600.
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              Tews, K., Busch, P. O., Jörgens, H. (2003). Helge 2003: The diffusion of new environmental policy instruments, in. European Journal of Political Research, 42(4), pp. 569-600.
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