prof. Petar Stoyanov - Sofia University St. Kliment Ohridski, е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

prof. Atanas Dermendzhiev, Veliko Tarnovo University, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. 

PhD Student Kaloyan Tsvetkov - Sofia University St. Kliment Ohridski, е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.