I, the undersigned, declare that: 

1. I am the author and owner of the copyright to this dissertation.
2. As part of the completion of my studies, I submit my dissertation to the University of Piraeus Library in electronic form (pdf, doc, etc.).
3. I give permission to the University of Piraeus Library to include it in its electronic collection and to make its material available for study and teaching in the Institutional Repository Dione: https://dione.lib.unipi.gr.
4. The distribution of content is subject to the rules of open or unrestricted access as set forth in the Creative Commons licenses.

Τhe declarant