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European Journal of Operational Research > 2008 > 189 > 1 > 269-291
Ekonomický časopis (Journal of Economics) > 2007 > 55 > 5 > 484-499
European Journal of Operational Research > 2008 > 189 > 1 > 269-291
Ekonomický časopis (Journal of Economics) > 2007 > 55 > 5 > 484-499