00318nam a22001217a 4500020001500000040000900015082002000024100001300044245004100057250001700098260004000115650004100155  a0816238677  cNust  a658.4034bHIL'L  aHillier   aIntroduction to Operations research   a3rd Edition   aCalifornia:bHolden-Day Inc,c1980.  aIntroduction to Operations research