Journal of Applied Sciences 4 ( 3 ): 398 - 405 , 2004
Journal of Applied Sciences 5 ( 4 ): 724 - 728 , 2005
Journal of Applied Sciences 5 ( 6 ): 1036 - 1040 , 2005
Journal of Applied Sciences 6 ( 2 ): 333 - 339 , 2006
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