GUPTA, PREM KUMAR. operations research : Introduction / PREM KUMAR GUPTA, D. S. HIRA. - NEW DELHI, CHAND & COMPANY LTD, 1986. - 918 p. illus. 24 cm. LCCN: 57005907 Subjects--Topical Terms: Operations research.Research, Industrial. LC Class. No.: Q175 / .C478 Dewey Class. No.: 658.4034 / P O