000 00264nam a2200109Ia 4500
008 220201s2018 xx 000 0 eng d
100 _aGUPTA, P.K. & HIRA, D.S.
245 0 _aOPERATIONS RESEARCH
260 _aDELHI
_bS. CHANS
_c2018
300 _a1498
942 _2ddc
999 _c69452
_d69452