We would like to give credit to Professor Nikolaos Karampetakis of School of Mathematics, Aristotle University of Thessaloniki for the main background picture of Thessaloniki and other beautiful pictures of Thessaloniki.

We would like to give credit to Konstantinos Aivazidis, Quality Assurance Unit of Aristotle University of Thessaloniki, for his picture of Thessaloniki by night.

The pictures of Mount Athos and Meteora are credited to EOT (Greek Organization of Tourism).