机构:
Hebei Normal Univ, Coll Math & Informat Sci, Shijiazhuang 050016, Peoples R ChinaHebei Normal Univ, Coll Math & Informat Sci, Shijiazhuang 050016, Peoples R China
Yuan, Liping
Zamfirescu, Tudor
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机构:
Univ Dortmund, Dept Math, D-44221 Dortmund, Germany
Govt Coll Univ, Abdus Salam Sch, Lahore, Pakistan
Roumanian Acad, Math Inst, Bucharest, RomaniaHebei Normal Univ, Coll Math & Informat Sci, Shijiazhuang 050016, Peoples R China