M.E. Toriman, Othman Jaafar, Khairul Nizam Abdul Maulud, S.A. Sharifah Mastura, Nor Azlina Abdul Aziz, Muhammad Barzani Gasim, A.C. Er, Mohd Fuad Mat Jali, Nor Rohaizah Jamil and Md. Pauzi Abdullah
Journal of Engineering and Applied Sciences 6 ( 6 ): 428 - 432 , 2011