In front of conference site. In front: Konstantin Stavrev. From left: Renada Antova, Yordan Asenov, Vasil Popov, Lyubomir Iliev, Milcho Tsvetkov, Katya Tsvetkova, Aleksandar Antov, Asenka Asenova

Milan S. Dimitrijrevic, Milcho Tsvetkov

In front: Vasil Popov, Yordan Asenov. From left, Katya Tsvetkova, Milcho Tsvetkov, Renada Antova, Lyubomir Iliev, Asenka Asenova, Konstantin Stavrev, Aleksandar Antov

Aleksandar Antov, Vasil Popov, Renada Antova, Konstantin Stavrev, Katya Tsvetkova, Milcho Tsvetkov

Yordan Asenov, Renada, Antova, Aleksandar Tomic, Vasil Popov, Lyubomir Iliev, Milcho Tsvetkov, Katya Tsvetkov, Aleksandar Antov, Asenka Asenova

Katya Tsvetkova, Milcho Tsvetkov, Milan S. Dimitrijevic, Natasa Djurovic

Djordje Stanojevic and Nikola Tesla