1. Institute of Electronic and Informative systems, Yaroslav-the-Wise Novgorod State University,Veliky Novgorod,Russia
2. Institute of Electronic and Information Systems, Yaroslav-the-Wise Novgorod State University,Veliky Novgorod,Russia
3. Todor Kableshkov University of Transport,Faculty of Machinery and Construction Technologies in Transport,Sofia,Bulgaria
4. Todor Kableshkov University of Transport,Faculty of Telecommunication and Electrical Equipment in Transport,Sofia,Bulgaria
5. Olimex Ltd,Plovdiv,Bulgaria