OFFICE, E. Posters presented at the School of Environmental Sciences and Development of the North-West University, Potchefstroom Campus, South Africa on 05 October 2012. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt;, v. 33, n. 1, p. 2 bladsye, 21 out. 2014.