Weiwei Liu and Kexin Bi
Journal of Applied Sciences 13 ( 8 ): 1392 - 1396 , 2013
Kexin Bi, Huizi Ma and Ping Huang
Journal of Applied Sciences 13 ( 9 ): 1473 - 1478 , 2013
Weiwei Liu and Kexin Bi
Journal of Applied Sciences 13 ( 12 ): 2331 - 2335 , 2013