K.B. Yeo and E.H. Lim
Journal of Applied Sciences 10 ( 21 ): 2663 - 2667 , 2010
M.T. Fadzlita, K.B. Yeo, W.H. Choong and M. Melvin
Journal of Applied Sciences 14 ( 22 ): 3106 - 3109 , 2014