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Ssali, H (1990) Initial and residual effects of nitrogen fertilizers on grain yield of a maize/bean intercrop grown on a Humic Nitosol and the fate and efficiency of the applied nitrogen. Fertilizer Research, 23 (2). pp. 63-72. ISSN 0167-1731
Frederickson, D E and Mantle, P G and Milliano, W A J De (1991) Claviceps africana sp. nov.; the distinctive ergot pathogen of sorghum in Africa. Mycological Research, 95 (9). pp. 1101-1107. ISSN 0953-7562