N.Z. M. Saat, A.A. Jemain and K. Ibrahim
Journal of Applied Sciences 10 ( 9 ): 752 - 758 , 2010
K. Ibrahim, M.N. Shamsudin, R. Yacob and A. Radam
Trends in Applied Sciences Research 9 ( 9 ): 522 - 533 , 2014