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Qiaoyu TIAN1; Shengzhi ZHANG2; Yonglin XU1; Jia MU1;
[1]School of Mathematics and Computer Science, Northwest University for Nationalities, Gansu 730030, P. R. China;
[2]Department of Mathematics, Gansu Normal University for Nationalities, Gansu 747000, P. R. China;
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