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Karaev, M.T. New Proofs of the Haagerup--de la Harpe Inequality. Mathematical Notes 75, 731–733 (2004). https://doi.org/10.1023/B:MATN.0000030981.50467.2f
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DOI: https://doi.org/10.1023/B:MATN.0000030981.50467.2f