C.N. Obi and C.O. Okocha
Journal of Engineering and Applied Sciences 2 ( 5 ): 920 - 929 , 2007
C.N. Obi and I.J. Ozugbo
Research Journal of Applied Sciences 2 ( 1 ): 22 - 25 , 2007
C.N. Obi and A.J. Igbokwe
Research Journal of Biological Sciences 2 ( 2 ): 161 - 166 , 2007