Please accept our sincere gratitude for granting us the opportunity to publish our work and our congratulations for the exemplary quality of our volume. It has been, indeed, a great pleasure and honor for us to cooperate with Nova Publishers. I hope that we will continue our cooperation in the near future.

Nikolaos V. Kantartzis
School of Electrical and Computer Engineering
Aristotle University of Thessaloniki
Thessaloniki
Greece