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Problemi na ocenkata na prinosa na BAN v socialno-ikonomičeskoto razvitie
Popova, Violeta; Dimitrov, Nikolaj - In: Spisanie na Bălgarskata Akademija na Naukite 28 (1982) 5, pp. 71-74
Persistent link: https://www.econbiz.de/10002666212
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Naučno-techničeski progres : metodologija i analiz na efektivnostta
Popova, Violeta (revision) - 1989
Persistent link: https://www.econbiz.de/10000792705