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2. Carbonatites in the Rufunsa valley, Feira district;Bailey;Bull. N. Rhod. geol. Surv.,1960
3. Garson M. S. , 1961. The Tundulu carbonatite ring complex in southern Nyasaland. Ph.D. Thesis, Univ. Leeds.
4. The alkaline district of Alno Island;Eckermann;Sver. Geol. Undersok.,1948
5. Dawson J. B. , 1960. A comparative study of the geology and petrography of the kimberlites of the Basutoland province. Ph.D. thesis, Univ. Leeds.