S. Hamdan, D.M.A. Hashim, M.Z. Abdul Rahman, M. Ahmad and W.F. Wan Abdullah
Journal of Applied Sciences 2 ( 4 ): 518 - 521 , 2002
S. Hamdan, M.Z. Abdul Rahman, D.M.A. Hashim and N. Ahmad
Journal of Applied Sciences 2 ( 7 ): 710 - 712 , 2002