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Sbornik materiali ot Dvustrannata Bălgaro-Rumănska Konferencija "Naučni Problemi na Reka Dunav ̋
4 - 7 noemvri 1983, Varna ; 7 - 10 noemvri 1983, Tulča = Proceedings of the Bilateral Bulgarian-Romanian Conference "Scientific Problems of the Danube" -
Sbornik materiali ot Dvustrannata Bălgaro-Rumănska Konferencija "Naučni Problemi na Reka Dunav"
4 - 7 noemvri 1983, Varna ; 7 - 10 noemvri 1983, Tulča = Proceedings of the Bilateral Bulgarian-Romanian Conference "Scientific Problems of the Danube" -
Sbornik materiali ot Dvustrannata Bălgaro-Rumănska Konferencija "Naučni Problemi na Reka Dunav"
4 - 7 noemvri 1983, Varna ; 7 - 10 noemvri 1983, Tulča = Proceedings of the Bilateral Bulgarian-Romanian Conference "Scientific Problems of the Danube"