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This research was supported by a grant from La Trobe University.
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Dragomir, S.S., Mond, B. On the superadditivity and monotonicity of Gram's inequality and related results. Acta Math Hung 71, 75–90 (1996). https://doi.org/10.1007/BF00052196
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DOI: https://doi.org/10.1007/BF00052196