H.C.C. Maduka, A. Salihu and V.A. Onwuliri
Journal of Biological Sciences 3 ( 8 ): 711 - 717 , 2003
F.O. Obi, H.C.C. Maduka and Y.P. Mamza
Journal of Biological Sciences 3 ( 10 ): 875 - 881 , 2003