Ahyaie, MohsenAlami, AhmedChihani, SaidFrost, ChristianGerlach, JochenHowar, FalkKarla, DavidMay, ChristianNikolova, SvetlaPeschke, Marc2008-02-192008-02-192008-02-19http://hdl.handle.net/2003/2504710.17877/DE290R-8899de004study thesis