Computers & Operations Research
Computers and Operations Research > 2009 > 36 > 1 > 196-208
Computers and Operations Research > 2009 > 36 > 1 > 149-166
Computers and Operations Research > 2009 > 36 > 1 > 196-208
Computers and Operations Research > 2009 > 36 > 1 > 149-166