STUDIES OF ORGANIC MATTER IN THE TRIASSIC CARBONATES OF NORTHERN BULGARIA.VUCHEV VT.1974; IN: ADV. ORG. GEOCHEM. PROC. 6TH INT. MEET. ORG. GEOCHEM.; RUEIL-MALMAISON; 1973; PARIS TECHNIP; 1974, P. 489 A 505Miscellaneous

BLACK SEA STUDIES IN BULGARIA - A BRIEF SURVEY.VUCHEV VT.1974; A.A.P.G., MEM.; USA; 1974, NUM. 0020, P. 90 A 96Serial Issue

DEVELOPMENT OF GEOMATHEMATICS IN BULGARIA.VUCHEV VT.1972; J. INTERNATION. ASS. MATH. GEOL.; USA; 1972, VOL. 4, NUM. 0001, P. 81 A 82Miscellaneous

GEOLOGIC EVOLUTION OF BULGARIA IN LIGHT OF PLATE TECTONICS.HSU KJ; NACHEV IK; VUCHEV VT et al.1977; TECTONOPHYSICS; NETHERL.; DA. 1977; VOL. 40; NO 3-4; PP. 245-256; BIBL. 1 P.; 5 ILL.Article

THE PRESENCE AND GEOCHEMICAL SIGNIFICANCE OF ORGANIC MATTER EXTRACTABLE FROM JURASSIC AND TRIASSIC SEDIMENTS OF NORTHERN BULGARIA.VUCHEV VT; HOWELLS WG; BURLINGAME AL et al.1971; IN: 5TH INT. MEET. ORG. GEOCHEM., HANNOVER, 1971.; 1971Miscellaneous

THE PRESENCE AND GEOCHEMICAL SIGNIFICANCE OF ORGANIC MATTER EXTRACTABLE FROM JURASSIC AND TRIASSIC SEDIMENTS OF NORTHERN BULGARIA.VUCHEV VT; HOWELLS WG; BURLINGAME AL et al.1972; INTERNATION. SER. MONOGR. EARTH SCI; GBR; 1972, VOL. 32, P. 365 A 386Miscellaneous

PRELIMINARY ORGANIC GEOCHEMICAL STUDIES OF DSDP CORES, LEG 42B, BLACK SEA.VUCHEV VT; VYCHEV VT; IVANOV CH P et al.1978; INITIAL REPORTS OF THE DEEP SEA DRILLING PROJECT/1975/ISTANBUL, TURKEY TO ISTANBUL, TURKEY; USA; WASHINGTON: U.S. GOVERNMENT PRINTING OFFICE; DA. 1978; VOL. 42; NO 2; PP. 723-728; BIBL. 4 REF.; 10 ILL.; 6 ANAL.Book Chapter