@misc{OPUS4-4610, title = {Wuppertal Bulletin zu Instrumenten des Klima- und Umweltschutzes : Jg. 7, Nr. 2}, publisher = {Wuppertal Institut f{\"u}r Klima, Umwelt, Energie}, address = {Wuppertal}, issn = {1618-3959}, pages = {38}, year = {2004}, language = {de} }