<style face="normal" font="default" size="100%">The bark of holm oak (Quercus ilex, L.) for airborne Cr(VI) monitoring.</style>

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<style face="normal" font="default" size="100%">The bark of holm oak (Quercus ilex, L.) for airborne Cr(VI) monitoring.</style>

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17

<style face="normal" font="default" size="100%">Heavy metal accumulation in leaves affects physiological performance and litter quality of Quercus ilex L.</style>

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<style face="normal" font="default" size="100%">Tree bark as a bioindicator of air pollution in Navarra, Spain</style>