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Journal of Central European Green Innovation

  1. Journal of Central European Green Innovation [elektronický zdroj] : international electronic journal. -- 2013-. -- Gyöngyös : Károly Róbert Főiskola. -- online. -- Raz za pol roka. -- ISSN 2064-3004. http://greeneconomy.karolyrobert.hu/en obnoviteľné energetické zdroje
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