Kalvachev, Yu.
Zgureva, D.
Boycheva, S.
Barbov, B.
Petrova, N.
Funding for this research was provided by:
Operational Programme ‘‘Human Resources Development’ ((BG051PO001-3.3-06-0027))
Operational Programme ‘‘Human Resources Development’’ ((BG051PO001-3.3-06-0027))
Karoll Financial Group (Karoll Financial Group)