The author

Atanas Parushev, Veselin Nachev, Galab Galabov, Dinko Stoev, Ivo Bistrichki, Ilian Lalev, Katrin Tomova, Konstantin Kostov, Lyuben Genov, Radoil Serafimov, Rumen Gasharov, Stefan Bojkov, Yavora Petrova