Nitrogen dioxide - a gaseous fertilizer of poplar trees

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Schmutz, P., Tarjan, D., Günthardt-Goerg, M. S., Matyssek, R., & Bucher, J. B. (1995). Nitrogen dioxide - a gaseous fertilizer of poplar trees. Phyton. Annales Rei Botanicae, 35(2), 219-232.