C.Y. Abasi, A.A. Abia and J.C. Igwe
Environmental Research Journal 5 ( 3 ): 104 - 113 , 2011
J.C. Igwe, O.F. Mbonu and A.A. Abia
Journal of Applied Sciences 7 ( 19 ): 2840 - 2847 , 2007
S.A. Odoemelam, C.U. Iroh and J.C. Igwe
Research Journal of Applied Sciences 6 ( 1 ): 44 - 52 , 2011