Pienaar, W. (2005). Estimation of increased regional income that emanates from economically justified road construction projects. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt;, 24(4), 108-117. https://doi.org/10.4102/satnt.v24i4.179