Minnaar, M., Strasser, R. and Kruger, G. 2013. Sulphur dioxide contamination and drought lead to reduced PSII-activity and CO₂ assimilation in maize plants (<i>Zea mays</i>). Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt;. 32, 1 (Dec. 2013), 1 page. DOI:https://doi.org/10.4102/satnt.v32i1.811.