Leaf and stem structure of poplar (Populus ×euramericana) as Influenced by O3, NO2, their combination, and different soil N supplies  

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Günthardt-Goerg, M. S., Schmutz, P., Matyssek, R., & Bucher, J. B. (1996). Leaf and stem structure of poplar (Populus ×euramericana) as Influenced by O3, NO2, their combination, and different soil N supplies
 . Canadian Journal of Forest Research, 26(4), 649-657. https://doi.org/10.1139/x26-075