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https://de.wikipedia.org/wiki/Akt_und_Potenz
World Development Report 2016 - The World bank Digital Dividends http://www-wds.worldbank.org/external/default/WDSContentServer/WDSP/IB/2016/01/13/090224b08405ea05/2_0/Rendered/P DF/World0developm0000digital0dividends.pdf
Credit Outlook Fitch 2016
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