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Onstott, T.C., R.B. Hargraves, P. Joubert, and D.L. Reid. 1986. “Constraints on the Tectonic Evolution of the Namaqua Province I: Palaeomagnetic and 40 Ar 39Ar Results from the Richtersveld Subprovince ( South Africa).”. Transactions - Geological Society of South Africa 89: 117-42. Referenced from www.scopus.com: Constraints on the tectonic evolution of the Namaqua Province I: palaeomagnetic and 40 Ar/39Ar results from the Richtersveld subprovince ( South Africa).

Onstott, T.C., R.B. Hargraves, and P. Joubert. 1986. “Constraints on the Tectonic Evolution of the Namaqua Province II: Reconnaissance Palaeomagnetic and 40 Ar 39Ar Results from the Namaqua Province and Kheis Belt ( South Africa).”. Transactions - Geological Society of South Africa 89: 143-70. Referenced from www.scopus.com: Constraints on the tectonic evolution of the Namaqua Province II: reconnaissance palaeomagnetic and 40 Ar/39Ar results from the Namaqua Province and Kheis Belt ( South Africa).