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Gupta P. K., Hira D. S., . (19762021). Operations Research. New Delhi: S Chand and Company Limited.
Gupta P K, Hira D S, . 19762021. Operations Research. New Delhi: S Chand and Company Limited.
Gupta P K, Hira D S, . Operations Research. New Delhi: S Chand and Company Limited. 19762021.
