00287nam a2200133Ia 4500020000900000082000900009100001800018245008100036250000600117260000900123300000900132500000600141650000600147  aNULL  aNULL  aWagner, H. M. 0aPrinciples of Operations Research, with Applications to Managerial Decisions  a-  a-b-  aNULL  a0  a-