Sofia University St. Kliment Ohridski
https://www.uni-sofia.bg/index.php/eng/the_university
Varna University of Management
https://vum.bg/
University of Economics – Varna
https://www.ue-varna.bg/
University of Liège
https://www.uliege.be/cms/c_8699436/en/uliege
PSUT Portal 
