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ErQKL €a€` pp.59-73 OPrQ€RC ST91998< lÑQ^_£ 1 Fñ_C F^_²UV 49(12) 639-667C xyz{ O s92006< vw^_VW9 F EL ûa õ €XY Z ] Ú< ˜&J 0sC []^QR\_`QHJabQcD dQ7efg92001< EEMS g R•–£¤a †ÃÄC de sh 24(10) 686-692C ijkl92009< p5 g5Û ­ ·— F $> U +-! g ” ÆÇ93-3< In UÚlmÆÇmnop Ð1 20 ьŽU š ÊÍ-PQ Å ^_ÆÇVWqCpp.44-63 ˜&mnC Waite T.D. and Morel, F.M. (1984) Ligand exchange and fluorescence quenching studies of thefulvic acid-iron interactionCAnal. Chim. Acta. 162 263-274C Yazawa, Y., Mikouchi, T. and Takeda, H. 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