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http://ec.europa.eu/economy_finance/db_indicators/surveys/documents/studies/bci_presentation_paper.pdf
. Accessed Apr 2017
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https://ec.europa.eu/info/sites/info/files/bcs_user_guide_en_0.pdf
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https://ec.europa.eu/info/sites/info/files/tp015_en.pdf
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https://rg.ru/2007/12/06/statistika-dok.html
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http://ec.europa.eu/economy_finance/db_indicators/surveys/documents/studies/economic_climate_tracer_en.pdf
. Accessed Apr 2017