1. Uric acid lithiasis in the Sudan;Ibrahim;J. Trop. Med. Hyg.,1977
2. Hyperuricaemia in Sudanese urinary stone formers;Ibrahim;Sudan Med. J.,1977
3. Colorimetric micro-determination of calcium in serum;Trinder;Analyst,1960
4. Determination of uric acid in human blood;Brown;J. Biol. Chem.,1945
5. Micro-analysis;Wooton,1974