Rwezaula G. John, Loth S. Mulungu, Christine G. Ishengoma, Shazia O.W.M. Reuben, Susan N. Msolla, Amon P. Maerere, Paul J.R. Njau, G. C. Ashimogo, T. Tiisekwa, T. Mvena and Henry S. Laswai
Asian Journal of Plant Sciences 4 ( 6 ): 580 - 588 , 2005