Eijsackers, H., Maboeta, M., & Doelman, P. (2006). Vital soil as basis for sustainable soil management, a survey of soil problems in The Netherlands and the way to tackle it, with an assessment for the South African situation. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt;, 25(4), 300-317. https://doi.org/10.4102/satnt.v25i4.174