Research Journal of Physics 1 ( 1 ): 35 - 41 , 2007
S.N. Agbo and C.E. Okeke
Trends in Applied Sciences Research 2 ( 3 ): 251 - 254 , 2007
Trends in Applied Sciences Research 2 ( 3 ): 224 - 230 , 2007
Trends in Applied Sciences Research 2 ( 3 ): 246 - 250 , 2007