This book has been written as a PhD thesis during my time as a stipend and as a research assistant at Heinrich-Heine-Universität Düsseldorf. I want to thank several people that have helped me in various ways during its development.
First, I would like to thank my supervisor Gottfried Vosgerau for his tremendous support. Without his help, both academic and otherwise, this book wouldn’t have been possible. Secondly, I would like to thank my second supervisor, Christoph Kann, for his helpful insights. I would like to thank my colleagues René Baston, Tim Seuchter and Arne Weber for their fruitful comments and discussion that helped to shape the core ideas of this book. I would like to thank VG WORT for financially supporting the printing of this book. Lastly, I would like to give special thanks to those people whose moral support has helped me through the ups and downs of the whole writing process: my parents, Hans-Willi and Cornelia, my brother Dani, Nina, and my friends.