by Mwai, Gideon N., Onyango, John C., A-O, Mary
Published in African journal of food, agriculture, nutrition, and development : AJFAND (07.07.2007)

by Gichimu, Bernard M, Owuor, Barack O, Mwai, Gideon N, Dida, Mathews M
Published in Journal of agricultural and biological science (2009)