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Zuraidah Yahya, Aminuddin Husin, Jamal Talib, Jamarei Othman, Osumanu H. Ahmed and Mohamadu B. Jalloh
American Journal of Applied Sciences 7 ( 3 ): 343 - 348 , 2010
Lee J. Huey, Osumanu H. Ahmed and Nik M.A. Majid
American Journal of Applied Sciences 7 ( 7 ): 933 - 936 , 2010