000 00286nam a2200121Ia 4500
008 220201s1969 xx 000 0 eng d
082 _a658
100 _aGhosal, A
245 0 _aElements of operational researca
260 _bHindustan publishing
_c1969
300 _a207
942 _2ddc
999 _c77707
_d77707