Edwar Yazid, Setyamartana Parman and Khairul Fuad
Journal of Applied Sciences 11 ( 10 ): 1716 - 1724 , 2011
Edwar Yazid, Mohd. Shahir Liew and Setyamartana Parman
Journal of Applied Sciences 12 ( 23 ): 2383 - 2389 , 2012