Durand, J. F., Departement Dierkunde, Randse Afrikaanse Universiteit, Aucklandpark
-
Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i> Vol 23 No 3 (2004) - Oorspronklike Navorsing
The discovery of an engraving near Mapungubwe that could have been used as an abacus
Abstract PDF