Ravindran, A. Operations research : principles and practice / A. Ravindran, Don T. Philips. - 2nd ed. - New York : John Wiley & Sons, 1986. - xviii, 637 p. : 24 cm. ISBN: 9971513021 : KES 915 Subjects--Topical Terms: Operations research. LC Class. No.: T57.6 / .R38 1986