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\bibitem{Urbina_etal2020} Urbina, I., Grau, O., Sardans, J., Ninot, J. M., \& Pe{\~n}uelas, J. (2020). Encroachment of shrubs into subalpine grasslands in the Pyrenees changes the plant-soil stoichiometry spectrum. \textit{Plant Soil}, \textit{448}(1-2), 37--53.

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