Smithies, Robert H, Marsh, Julian S. The Marinkas Quellen Carbonatite Complex, southern Namibia: carbonatite magmatism with an uncontaminated depleted mantle signature in a continental setting. 1998.

Smithies, Robert H, Marsh, Julian S. Alkaline rocks in the Kuboos-Bremen Igneous Province, southern Namibia: the Grootpenseiland and Marinkas Kwela Complexes. 1996.