CNCSIS - http://cncsis.gov.ro/userfiles/file/CENAPOSS/B_partial_2011.pdf
EBSCO - http://www.ebscohost.com/titleLists/e5h-coverage.htm
EPA - http://epa.oszk.hu/html/vgi/kereses/eredmeny_sorsz.phtml
PROQUEST - http://www.proquest.com/
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