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European Journal of Operational Research > 2011 > 212 > 1 > 43-53
European Journal of Operational Research > 2010 > 205 > 2 > 469-478
European Journal of Operational Research > 2011 > 212 > 1 > 43-53
European Journal of Operational Research > 2010 > 205 > 2 > 469-478