Journal of Engineering and Applied Sciences 3 ( 6 ): 451 - 454 , 2008
Journal of Engineering and Applied Sciences 3 ( 9 ): 735 - 741 , 2008
Research Journal of Applied Sciences 3 ( 4 ): 311 - 316 , 2008
Research Journal of Applied Sciences 3 ( 5 ): 345 - 351 , 2008