M.R. Mustapha, H.S. Lim and M.Z. Mat Jafri
Journal of Applied Sciences 10 ( 22 ): 2847 - 2854 , 2010
N. Othman, M.Z. Mat Jafri, H.S. Lim and K. Abdullah
Journal of Applied Sciences 10 ( 23 ): 3021 - 3031 , 2010