CHARACTERIZATION OF DEPRESSED MUTANT OF F-LIKE PLASMID PAP18-1 ENCODING TETRACYCLINE RESISTANCE IN ESCHERICHIA-COLI Статья SHCHIPKOV V.P., BUYANOVA N.I., PEKHOV A.P. ANTIBIOTIKI I MEDITSINSKAYA BIOTEKHNOLOGIYA. IZD VO MEDITSINA. Том 31. 1986. С. 28-31
ON THE QUESTION OF POPULAR MOVEMENTS AND INTERNAL OPPOSITION IN FRANCE AT THE TURN OF THE 13TH-14TH CENTURIES Статья KEROV V.L. BULGARIAN HISTORICAL REVIEW-REVUE BULGARE D HISTOIRE. PUBL HOUSE BULGARIAN ACAD SCI. 1986. С. 46-60