000 00278nam a2200121Ia 4500
008 211214s9999 xx 000 0 und d
100 _aPK Gupta and Hira
245 _aOperations Research
260 _bS Chand
500 _a77280/19-20
650 _aEngg./VIII
942 _cBB
999 _c184832
_d184832