M.G. Maiangwa, A.O. Ogungbile, J.O. Olukosi and T.K. Atala
Journal of Applied Sciences 7 ( 6 ): 785 - 795 , 2007
O.B. Adeniji, J.P. Voh, T.K. Atala and A.O. Ogungbile
Journal of Applied Sciences 7 ( 3 ): 397 - 401 , 2007