Computers & Operations Research
Computers and Operations Research > 2009 > 36 > 2 > 549-564
Computers and Operations Research > 2009 > 36 > 2 > 623-636
Computers and Operations Research > 2009 > 36 > 2 > 549-564
Computers and Operations Research > 2009 > 36 > 2 > 623-636