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American Journal of Applied Sciences 3 ( 5 ): 1859 - 1863 , 2006
Ng Mei Han, Choo Yuen May, Ma Ah Ngan, Chuah Cheng Hock and Mohd. Ali Hashim
American Journal of Applied Sciences 3 ( 7 ): 1929 - 1932 , 2006
Puah Chiew Wei, Choo Yuen May, Ma Ah Ngan and Chuah Cheng Hock
American Journal of Environmental Sciences 1 ( 4 ): 264 - 269 , 2005
Harrison Lau Lik Nang, Choo Yuen May, Ma Ah Ngan and Chuah Cheng Hock
American Journal of Environmental Sciences 3 ( 2 ): 54 - 59 , 2007