Konstantin Preslavski University of Shumen
University of Rousse”Angel Kantchev”
Trakia University of Stara Zagora,Bulgaria
Bourgas Prof.Assen Zlatarov University
University of National and World Economy
University of Economics —Varna
Medical University — Sofia
Medical University — Varna
Technical University of Varna
University of Architecture,Civil Engineering and Geodesy
Technical University of Sofia
University of Chemical Technology and Metallurgy — Sofia
University of Mining and Geology “St. Ivan Rilski”
University of Food Ttechnologies—Plovdiv
Agricultural University — Plovdiv