Impairment of gas exchange and structure in birch leaves (Betula pendula) caused by low ozone concentrations 

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Matyssek, R., Günthardt-Goerg, M., Keller, T., & Scheidegger, C. (1991). Impairment of gas exchange and structure in birch leaves (Betula pendula) caused by low ozone concentrations
 . Trees: Structure and Function, 5(1), 5-13. https://doi.org/10.1007/BF00225329