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\bibitem{Mueller_etal2012} Mueller, L., Schindler, U., Shepherd, T. G., Ball, B. C., Smolentseva, E., Hu, C., et al. (2012). A framework for assessing agricultural soil quality on a global scale. \textit{Archives of Agronomy and Soil Science}, \textit{58}(sup1), S76--S82.

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