2.7 Acknowledgements

The preparation of this Chapter took longer than expected. For being understanding about the endless hours spent in front of the Macintosh at a time when I was needed for many more important reasons, for preparing the list of references and proof reading this lengthy text, and for never failing to be supportive, I am deeply grateful to my fiancee, Alicia. And for her outstanding support over many years and for numerous services associated with this project (including yet further proof reading!), I sincerely thank my always hard-working secretary, Monica.