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The Bibliography of Slavic Publications from the German Democratic Republic 1946-1986 (BibSlawPub) was converted from the the five volumes printed publication to a database and contains about 19.600 records. The overview for the volumes can be found here. The Classification overview is here.
Your search for Cvetkov, I. provides 2 hits | |
1 | Michail Scholochow in BulgarienCvetkov, I. - in: Michail Scholochow. Werk und Wirkung. Leipzig 1966. S. 182-189 |
2 | Maksim Gor'kij und die bulgarische Gesellschaft 1900-1944Cvetkov, I. A. - in: Wissenschaftliche Zeitschrift d. Humboldt-Univ. Berlin (GSR) 14 (1965) S. 225-230 |