prof. Latchezar Dimitrov

prof. Simeon Stoyanov

Stefan Ormandzhiev

assoc. prof. Valeri Genchev

assoc. prof. Mihail Madanski

assoc. prof. Arhangel Gigov

Yuri Nikolov

Ivan Mardov

Ivan Tishanski

prof. T. Yancheva

prof. D. Dasheva

PhD St. Tsvetkov

Erih Routemuoler, Germany

Gerd Mehaim, Germany

Shtephan Nop, Germany

Hubertos Busman, Germany

Bob Browaeys, Belgium

Jan Derks, Netherlands

Eric Whittie, Netherlands

Arie Schans, Netherlands

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