Authors
Gao Xiaoxing
Shijiazhuang University of Economics, Shijiazhuang, China
Liu Feng
Shijiazhuang University of Economics, Shijiazhuang, China
© 2015 Gao Xiaoxing, Liu Feng, published by Professor Subhas Chandra Mukhopadhyay
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.