1. Cancer in Africa;Parkin,2003
2. Stewart BW, Kleinhues P (eds.). World Cancer Report. Lyon, France: IARC Press; 2003.
3. The globalisation of cancer;Boyle;Lancet,2006
4. Berman C. In: Primary Carcinoma of the Liver. Great Britain: HK Lewis & Co.; 1951, p. 5.
5. Cancer in Africa, especially in regions to the south of the Sahara;Oettlé;J Natl Cancer Inst,1964