ESGUERRA, Clementina et al. The Uptake of SO2 and NO2 by Plants. Science Diliman: A Journal of Pure and Applied Sciences, [S.l.], v. 2, oct. 2007. ISSN 2012-0818. Available at: <https://journals.upd.edu.ph/index.php/sciencediliman/article/view/339>. Date accessed: 28 sep. 2025.