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\bibitem{Bellow_etal2008} Bellow, J. G., Nair, P. K. R., \& Martin, T. A. (2008). Tree-Crop Interactions in Fruit Tree-based Agroforestry Systems in the Western Highlands of Guatemala: Component Yields and System Performance. In S. Jose, \& A. M. Gordon (Eds.), \textit{Toward Agroforestry Design. Advances in Agroforestry} (Vol. 4). Dordrecht: Springer.

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