@ARTICLE {KAMARA:2010a, title = {Participatory evaluation of improved cowpea cultivars in the Guinea and Sudan savanna zones of north east Nigeria}, author = {Kamara, A. and Ellis-Jones, J. and Ekeleme, F. * and Omoigui, L. and Amaza, P. and Chikoye, D. and Dugje, I. *}, journal = {Archives of Agronomy and Soil Science}, year = {2010}, volume = {56}, number = {3}, pages = {355--370}, issn = {1476-3567}, }