Participants Technical University of Gabrovo Bulgaria Sofia University St. Kliment Ohridski Bulgaria University of Architecture Civil Engineering and Geodesy Bulgaria University of Architecture Civil Engineering and Geodesy Bulgaria Ghana Institute of Business Practitioners Ghana Democritus University of Thrace, Department of Electrical and Computer Engineering Greece Democritus University of Thrace, Department of Civil Engineering Greece Democritus University of Thrace, Department of Production and Management Engineering Greece University of Athens Greece Hellenic Mathematical Society (National Team) Greece Aistotle University Of Thessaloniki Greece National Technical University Of Athens Greece Petroleum University of Technology Iran Sharif University of Technology Iran Yazd University of Iran Iran Ss. Cyril and Methodius University Macedonia University of Bucharest Romania Alexandru Ioan Cuza University of Iasi Romania Technical University Gheorghe Asachi of Iasi Romania Technical University of Cluj Romania University Politehnica of Bucharest Romania Universitatea "Ovidius" Din Constanţa Romania University of Primorska Slovenia Magtymguly Turkmen State University Turkmenistan National Team Turkmenistan, The State Energy Institute of Turkmenistan Turkmenistan