T. L. Laban, J. P. Beukes, P. Van Zyl, and J. M. Berner, “Impacts of ozone on agricultural crops in southern Africa”, Clean Air J., vol. 25, no. 1, Jun. 2015, Accessed: Apr. 19, 2025. [Online]. Available: https://cleanairjournal.org.za/article/view/8435