Wessels, D. “The Possibilities of a Modelling Perspective for School Mathematics”. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt;, Vol. 28, no. 4, Sept. 2009, pp. 319-8, doi:10.4102/satnt.v28i4.69.