A. Kroner, P. Jaeckel, G. Brandl, and A.A. Nemchin. “Evolution of the Northeastern Kaapvaal Craton and the Central Limpopo Belt, South Africa, Based on Single-Zircon Ages (extended Abstract)”. Netherlands Journal of Geosciences, vol. 76, Jan. 1998, pp. 361-4, https://njgjournal.nl/index.php/njg/article/view/12322.