Li Zhao Xizheng Ke Zhiyun Yin Xiangchen Zhou Research on the Criterion of Wireless Optical Access System and Its Application. 192-196 2009 CSIE (1) http://doi.ieeecomputersociety.org/10.1109/CSIE.2009.59 conf/csie/2009 db/conf/csie/csie2009-1.html#ZhaoKYZ09