Isaak Vasileiadis (Aristotle University of Thessaloniki / GR), Professor Imad Belabbas (Université de Bejaia / DZ), Dr. Joanna Moneta (Institute of High Pressure Physics, Polish Academy of Sciences / PL), Dr. Julita Smalc-Koziorowska (Institute of High Pressure Physics, Polish Academy of Sciences / PL), Professor George Dimitrakopulos (Aristotle University of Thessaloniki / GR)