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Polish Journal of Management Studies > 2011 > Vol. 3 > 44-60
Studia Geotechnica et Mechanica > 2008 > Vol. 30, nr 1-2 > 189-198
Polish Journal of Management Studies > 2011 > Vol. 3 > 44-60
Studia Geotechnica et Mechanica > 2008 > Vol. 30, nr 1-2 > 189-198