AcknowledgementThis is it; the result of four years hard work, but also a period with a lot of fun and many new experiences.I am happy to present you the results, this thesis.To write this thesis without the help of many people was difficult if not impossible.Therefore I will devote this section to the people that helped me establishing it.I like to thank them by means of a fictitious journey past these people, by starting at my office at the University of Twente to arrive at my home at Groenlo.I will then start the journey at my office, room number 2120, to thank my room mate and project mate Olga Kulyk.We started our PhD projects at the same day.We had a nice time at this office, a lot of talks and laughings.Together with Dolf Trieschnigg
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