Operations Research Letters
Operations Research Letters > 2009 > 37 > 2 > 97-101
Operations Research Letters > 2009 > 37 > 2 > 93-96
Operations Research Letters > 2009 > 37 > 5 > 365-367
Operations Research Letters > 2009 > 37 > 6 > 405-410
Operations Research Letters > 2009 > 37 > 6 > 399-404