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Hebei Univ, Coll Phys Sci & Technol, Baoding 071002, Hebei, Peoples R China
North China Elect Power Univ, Sch Math & Phys, Baoding 071002, Hebei, Peoples R China Hebei Univ, Coll Phys Sci & Technol, Baoding 071002, Hebei, Peoples R China