000			00338nam a22001577a 4500
003			SGT
020			_a9788121902816
082			_a001.424,GUP
100			_aGUPTA,P.K.
245			_aOPERATION RESEARCH
250			_a7TH
260			_aNEW DELHI _bS. CHAND PUBLISHING _c2021
300			_a1498
650			_aRESEARCH
942			_2ddc _cBK
999			_c21604 _d21604