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Silva AM, Kong X, Hider RC (October 2009). „Determination of the pKa value of the hydroxyl group in the alpha-hydroxycarboxylates citrate, malate and lactate by 13C NMR: implications for metal coordination in biological systems“. Biometals. 22 (5): 771–8. doi:10.1007/s10534-009-9224-5. PMID19288211.
