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Research Papers of the Wroclaw University of Economics / Prace Naukowe Uniwersytetu Ekonomicznego we Wroclawiu. 2013, Issue 305, p118-128. 11p.
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Research Papers of the Wroclaw University of Economics / Prace Naukowe Uniwersytetu Ekonomicznego we Wroclawiu. 2012 Part 1, Issue 271, p302-312. 11p.