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Operations Research and Decisions > 2018 > Vol. 28, No. 1 > 57--74
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu > 2018 > 531 > 368-378
Operations Research and Decisions > 2018 > Vol. 28, No. 2 > 41--56
Operations Research and Decisions > 2018 > 28 > 2 > 41-56
Operations Research and Decisions > 2018 > 28 > 1 > 57-74