de Villiers, Michael. 2010. “From the Fermat Points to the De Villiers3 Points of a Triangle”. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt; 29 (3), 119-29. https://doi.org/10.4102/satnt.v29i3.16.