<style face="normal" font="default" size="100%">Factors affecting nutrient concentration and stoichiometry of forest trees in Catalonia (NE Spain)</style>

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<style face="normal" font="default" size="100%">Factors affecting nutrient concentration and stoichiometry of forest trees in Catalonia (NE Spain)</style>

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17

<style face="normal" font="default" size="100%">Oak trees and soil interactions in Mediterranean forests: a positive feedback model</style>