-N¨urnberg
vorgelegt von: Dipl.-Kfm. Andreas R. Engel
aus Marktredwitz
Referent: Professor Achim Wambach, Ph.D.
Koreferent: Professor Dr … . . . . . . . . . . . . . . . . . . . . . . . 80
v
Acknowledgements
First and foremost, I would like to thank my supervisor Achim Wambach for his
encouragement and … Procurement and it is joint work with Esther Hauk, Juanjo
Ganuza, and Achim Wambach. The last two authors wrote most of the …