S.C. Wang, K.Q. Yan and C.F. Cheng
Information Technology Journal 2 ( 2 ): 104 - 115 , 2003
Information Technology Journal 3 ( 3 ): 275 - 282 , 2004
Journal of Applied Sciences 4 ( 3 ): 344 - 353 , 2004
Journal of Applied Sciences 3 ( 7 ): 493 - 509 , 2003