Maree, J., Molepo, J., Owen, J. and Ehlers, R. 2005. Problem-based approach to mathematics in grades 9 and 11 in the Limpopo Province. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt;. 24, 4 (Sep. 2005), 124-133. DOI:https://doi.org/10.4102/satnt.v24i4.181.