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Wiadomości Statystyczne. The Polish Statistician > 2021 > 66 > 12 > 1-23
South East European Journal of Economics and Business > 2007 > 2 > 2 > 23-30
South East European Journal of Economics and Business > 2007 > 2 > 2 > 23-30
South East European Journal of Economics and Business > 2007 > 2 > 2 > 23-30