by Rüdiger Wolfrum, Christine Langenfeld, Petra Minnerop
Erich Schmidtc2005Berichte / Umweltbundesamt
2/05 , Environmental research of the Federal Ministry of the Environment, Nature Conservation and Nuclear Safety
Erich Schmidt2003Berichte / Umweltbundesamt
1/03 , Environmental research of the Federal Ministry of the Environment, Nature Conservation and Nuclear Safety