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- [3] Proof without Words: Inequality for the Sum of the Diagonals MATHEMATICAL INTELLIGENCER, 2021, 43 (04): : 32 - 32
- [4] Proof without Words: Inequality for the Sum of the Diagonals The Mathematical Intelligencer, 2021, 43 : 32 - 32
- [10] A note on Chebyshev's 'other' inequality BOLETIN DE LA SOCIEDAD MATEMATICA MEXICANA, 1999, 5 (01): : 137 - 141