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Business and Economic Horizons > 2015 > 11 > 1 > 1-13
Folia Oeconomica Stetinensia > 2014 > 14 > 2 > 140-151
Business and Economic Horizons > 2015 > 11 > 1 > 1-13
Folia Oeconomica Stetinensia > 2014 > 14 > 2 > 140-151