E.A. Adebile, B.N. Akintewe and J.K. Ogunmoyela
Journal of Engineering and Applied Sciences 2 ( 3 ): 509 - 515 , 2007
E.A. Adebile, B.N. Akintewe and O.K. Koriko
Research Journal of Applied Sciences 2 ( 4 ): 404 - 409 , 2007