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China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gui-Xiu","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Mathematics and Statistics, Qinghai Normal University, Xining, P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hong-Ying","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Mathematics and Statistics, Xi\u2019an Jiaotong University, Xi\u2019an, P. R. 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