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Hardy G H, Littlwood J E & Polya G. (1952). Inequalities. : .
Hardy G H, Littlwood J E and Polya G. 1952. Inequalities. : .
Hardy G H, Littlwood J E and Polya G. (1952). Inequalities. : .
Hardy G H, Littlwood J E and Polya G. Inequalities. : . 1952.