Miklós Hajdu
Budapest University of Technology and Economics, Hungary
E-mail: miklos.hajdu63@gmail.com
Orsolya Bokor
Northumbria University, United Kingdom
E-mail: orsolya.bokor@northumbria.ac.uk
Attila Varga
Diamond Congress Ltd., Hungary
E-mail: diamond@diamond-congress.hu
Hohol Róbert
Diamond Congress Ltd., Hungary
E-mail: hoholr@diamond-congress.hu