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Hebei Normal Univ, Coll Math & Informat Sci, Shijiazhuang 050024, Hebei, Peoples R China
Shijiazhuang Tiedao Univ, Dept Math & Phys, Shijiazhuang 050045, Hebei, Peoples R China Hebei Normal Univ, Coll Math & Informat Sci, Shijiazhuang 050024, Hebei, Peoples R China