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International Transactions in Operational Research > 25 > 4 > 1315 - 1322
Electronic Notes in Discrete Mathematics > 2015 > 50 > C > 237-242
Discrete Applied Mathematics > 2013 > 161 > 10-11 > 1356-1362
Discrete Applied Mathematics > 2008 > 156 > 7 > 1132-1142