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Trippa, R and Rohrbach, D D (2001) Policies for African seed enterprise development. Food Policy, 26 (2). pp. 147-161.
Jones, R B and Audi, P A and Trippa, R (2001) The role of informal seed systems in disseminating modern varieties: example of pigeon pea in semi-arid area of Kenya. Experimental Agriculture, 37 (4). pp. 539-548. ISSN 0014-4797