He remembers those vanished years. As though looking through a dusty window pane, the past is something he could see, but not touch. And everything he sees is blurred and indistinct. That era has passed. Nothing that belonged to it exists anymore. I would like to express my sincere thanks to everyone who contributed to this research, directly or indirectly. Above all, special thanks to my advisor Javier for his guidance and support within this work. A small fraction of the gratitude toward him is about this thesis, the most part of it is about the opportunity he has given me to learn. And last, but not least, I am very much indebted to my family whom I owe everything, what I have and what I am.
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