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%T Metoda Badania %A Panek, Tomasz %A Czapinski, Janusz %A Kotowska, Irena E. %J Contemporary Economics %N Spec. Issue %P 30-39 %V 7 %D 2015 %@ 2300-8814 %C POL %G pl %9 journal article %W GESIS - http://www.gesis.org %~ SSOAR - http://www.ssoar.info