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Online since: June 2012
Authors: Lu Lu Guo, Hong Guang Wang, Xiao Zhi He, Mei Tian, Dan Shu Yao, Jian She Hu
Acknowledgements
This work was financially supported by the Fundamental Research Funds for the Central Universities(N100405005,N110705001) , the Science and Technology Department of Liaoning Province (20101033), Natural Science Fundamental of Liao Ning Province(201102061) and Scientific and Technical Bureau Foundation of Shen Yang City(F10-205-1-30).