Operations Research Letters
Operations Research Letters > 2006 > 34 > 6 > 660-672
Operations Research Letters > 2006 > 34 > 6 > 653-659
Operations Research Letters > 2006 > 34 > 6 > 692-696
Operations Research Letters > 2006 > 34 > 6 > 706-712
Operations Research Letters > 2006 > 34 > 6 > 647-652