R.M. Gesimba, E. Njoka and M. Kinyua
Asian Journal of Plant Sciences 3 ( 4 ): 512 - 515 , 2004
R.M. Gesimba, M.C. Langat, G. Liu and J.N. Wolukau
Journal of Applied Sciences 5 ( 2 ): 334 - 336 , 2005