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1Periodical
Authors: Eftimov, T., Enchev, Y., Tsekov, I., Simeonov, P., Kalvatchev, Z., Encheva, E.
Source: NEUROSURGICAL REVIEW. 39(1):47-53
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2Periodical
Authors: Petkova, R., Chelenkova, P., Yemendzhiev, H., Tsekov, I., Chakarov, S., Kalvatchev, Z.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT. 27(6):4217-4221
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3Periodical
Authors: Petkova, R., Tsekov, I., Yemendzhiev, H., Kalvatchev, Z.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT. 26(1):2689-2694
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4Periodical
Authors: Tsekov, I., Ferdinandov, D., Stoyanova, S.H.D., Kacarov, K., Kalvatchev, Z.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT. 25(1):2262-2265
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5Periodical
Authors: Tsekov, I., Ferdinandov, D., Bussarsky, V., Hristova, S., Kalvatchev, Z.
Source: JOURNAL OF MEDICAL VIROLOGY. 83(9):1608-1613
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6Periodical
Authors: Slavov, S., Tsekov, I., Kalvatchev, Z.
Source: JOURNAL OF MEDICAL VIROLOGY. 82(2):325-330
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7Periodical
Authors: Borissov, K., Tsekov, I., Gavazova, R., Kalvatchev, Z., Argirova, R.
Source: JOURNAL OF MEDICAL VIROLOGY. 82(1):8-13
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8Periodical
Authors: Tsekov, I., Ferdinandov, D., Ignatova, V., Kalvatchev, Z.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT. 23(3):1360-1363
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9Periodical
Authors: Slavov, S., Kalvatchev, Z., Simeonov, P., Mladenov, D., Tsvetkov, M., Hristova, L., Kotsev, J.
Source: LABORATORY MEDICINE -PHILADELPHIA THEN CHICAGO-. 39(8):470-480
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10Periodical
Authors: Kalvatchev, Z., Rosl, F.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT. 21(2):137-144
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11Periodical
Authors: Slavov, S., Kalvatchev, Z.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT. 20(2):9-16
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12Periodical
Authors: Hadzhiolova, T., Pavlova, S., Kalvatchev, Z., Kotseva, R.
Source: LABORATORY MEDICINE -PHILADELPHIA THEN CHICAGO-. 37(3):161-165
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13Periodical
Authors: Draganov, P., Mateev, G., Botev, I., Kalvatchev, Z.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT. 20(1):107-110
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14Periodical
Authors: Draganov, P., Todorov, S., Todorov, I., Karchev, T., Kalvatchev, Z.
Source: INTERNATIONAL JOURNAL OF PEDIATRIC OTORHINOLARYNGOLOGY. 70(3):469-473
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15Periodical
Authors: Kalvatchev, Z., Draganov, P.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT. 19(3):9-14
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16Periodical
Authors: Draganov, P., Gancheva, A., Georgiev, D., Sapunarova, S., Kalvatchev, Z.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT. 19(1):151-154
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17Periodical
Authors: Kalvatchev, Z., Draganov, P., Kalvatchev, N.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT. 18(3):3-13
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18Periodical
Authors: Draganov, P., Kalvatchev, Z., Papassavva, V., Sapunarova, S.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT.. 18(2):153-160
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19Periodical
Authors: Kalvatchev, Z., Draganov, P., Gancheva, A., Sayej, M.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT. (2):146-150
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20Periodical
Authors: Kalvatchev, Z., Draganov, P.
Source: BIOTECHNOLOGY AND BIOTECHNOLOGICAL EQUIPMENT. 17(1):9-16