作 者:Assoc. Prof. Dr Evgenia Tonkova ;Chief Assist. Prof. Dr Sevdalina Hristova ;Assist. Prof. Nadezhda Kalinova
出 处:Izvestiya: Journal of Varna University of Economics. 2012 ;(4).
出 版 社:University of Economics Varna
文 章 ID:153323209