ESJ April COVER PAGE
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PDFDOI (PDF): http://dx.doi.org/10.19044/esj.2018.v14n12p%25p
European Scientific Journal (ESJ)
ISSN: 1857 - 7881 (Print)
ISSN: 1857 - 7431 (Online)
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Publisher: European Scientific Institute, ESI.
ESI cooperates with Universities and Academic Centres on 5 continents.
