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Ulrich's Periodicals Directory: ulrichsweb.serialssolutions.com
INDEX COPERNICUS: http://www.indexcopernicus.com/
CiteFactor: http://www.citefactor.org/
Российский индекс научного цитирования (РИНЦ): http://elibrary.ru/
Academic Search EBSCOPublishing: http://www.ebscohost.com
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