Landolt, W., Günthardt-Goerg, M. S., Pfenninger, I., Einig, W., Hampp, R., Maurer, S., & Matyssek, R. (1997). Effect of fertilization on ozone-induced changes in the metabolism of birch (Betula pendula) leaves. New Phytologist, 137(3), 389-397. https://doi.org/10.1046/j.1469-8137.1997.00843.x