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Ntare, B R (1989) Evaluation of cowpea cultivars for intercropping with pearl millet in the Sahelian zone of West Africa. Field Crops Research, 20 (1). pp. 31-40. ISSN 0378-4290
Osman, M A (1989) IDRC Striga project. Striga physiology 3-D-85-0343: progress report, 1988 and experiments, 1989. Monograph. International Crops Research Institute for the Semi-Arid Tropics, Sahelian Center , Sadore, Niamey.