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\bibitem{Koponen_etal2003} Koponen, P., Nygren, P., Domenach, A. M., Le Roux, C., Saur, E., \& Roggy, J. C. (2003). Nodulation and dinitrogen fixation of legume trees in a tropical freshwater swamp forest in French Guiana. \textit{J. Trop. Ecol.}, \textit{19}, 655--666.

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