Mathematical Theory and Applications ›› 2016, Vol. 36 ›› Issue (4): 44-49.
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Zhou Yuanzheng1, Wang Yuejiao2, Qiu Yumei 1
1.School of Mathematics and Statistics,Changsha University of Science and Technology,Changsha 410014,China; 2.School of Mathematics and Statistics,Central South University,Changsha 410083,China