00291n   a2200121 a 4500000002100000001000700021005001700028082000800045100001600053245004500069260004200114300001300156B B                 00668620220201171822.0  a003  aSharma, J K  aMathematical Models in Operation reserch  aDelhibTata McGraw Hill Companyc1989  axv,620p.