du Plessis, J., L. Henning, and J. Berner. “Decline in the Photosynthetic Capability of Wheat Plants After Fumigation With SO<sub>2</sub> In Open-Top Chambers”. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt; 32, no. 1 (December 19, 2013): 1 page. Accessed April 30, 2024. http://satnt.co.za/index.php/satnt/article/view/435.