K.S. Ndi, G.P. Kofa, G. Tekem, N.P. Ngnie, E.V. Amba and G.J. Kayem
Journal of Engineering and Applied Sciences 8 ( 4 ): 104 - 108 , 2013
G.P. Kofa, S. Ndi Koungou, G.J. Kayem and R. Kamga
Journal of Engineering and Applied Sciences 8 ( 4 ): 97 - 103 , 2013