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- [1] Alexander JokiĆ,Radivoje Srejić,Petar A. Pfendt,Joanna Zakrzewska.Characterization of lake sediment humic acids from the Ćelije Lake system near Kruševac (Central Serbia) by13C and1H solution NMR and13C cpmas NMR[J].Water, Air, and Soil Pollution,1995