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Chawla,K.K. Operations research / K.K.Chawla ,Viijay Gupta and Bhusan K. Sharma. - Ludhiana : Kalyani Publishers, 2009 978-81-81-272-4982-3 Rs.150.00 * OPERATIONS RESEARCH * * Gupta, Vijay ; Sharma ,Bhusan K. * Title