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Balakrishnan V K, . (2005). Theory and Problems of Combinatorics. New Delhi: Tata McGraw Hill.
Balakrishnan V K, . 2005. Theory and Problems of Combinatorics. New Delhi: Tata McGraw Hill.
Balakrishnan V K, . Theory and Problems of Combinatorics. New Delhi: Tata McGraw Hill. 2005.