I. Ismayadi, M. Hashim, A.M. Khamirul and R. Alias
American Journal of Applied Sciences 6 ( 8 ): 1548 - 1552 , 2009
R. Alias, K. H. Ku Hamid and K. N. Ismail
Journal of Applied Sciences 11 ( 13 ): 2448 - 2451 , 2011