@ARTICLE {KAMARA:2011d, title = {Genetic gain in yield and agronomic characteristics of cowpea cultivars developed in the Sudan Savannas of Nigeria over the past three decades}, author = {Kamara, A. and Tefera, H. and Ewansiha, S. U. and Ajeigbe, H. and Okechukwu, R. and Boukar, O. and Omoigui, L. *}, journal = {Crop Science}, year = {2011}, month = {September}, volume = {51}, number = {5}, pages = {1877--1886}, issn = {0011-183X}, doi = {10.2135/cropsci2010.12.0698}, }