@misc{OPUS4-4608, title = {Wuppertal Bulletin zu Instrumenten des Klima- und Umweltschutzes : Jg. 6, Nr. 2}, publisher = {Wuppertal Institut f{\"u}r Klima, Umwelt, Energie}, address = {Wuppertal}, issn = {1618-3959}, pages = {39}, year = {2003}, language = {de} }