Greeff, F. and de Wet, L. (2013) “The combination of fisiological and tradisional user test techniques to evaluate social networks on various technological platforms”, Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt;, 32(1), p. 1 bladsy. doi: 10.4102/satnt.v32i1.411.