Anmerkungen:
During preparation of the final online PDF, Figure 16 (page 45) and Figure 19
(page 48) got disintegrated by the Adobe Acrobat™ file size reduction
algorithm. The pages identical to the printed version were added separately to
the online version. (21.09.2016) Original der Dissertation unter:
http://www.diss.fu-berlin.de/diss/receive/FUDISS_thesis_000000099735