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In page National and Kapodistrian University of Athens:

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Research conducted in the institutes of the metropolitan area of Athens accounted for more than 50% of the ISI-indexed scientific publications coming from Greece.[1][2][3] The Department of Informatics and Telecommunications has been ranked continuously among the 100 most important research institutes in the field of Computer Science, according to Academic Ranking of World Universities (ARWU).[4]