* Correspondence address: Department of Discrete Mathematics;
Adam Mickiewicz University;
Matejki;
48149;
60-769;
Poznair;
Poland. On leave from Mathematical Institute of the Polish Academy of Sciences and Adam Mickiewicz University;
Pomali;
Poland. Partially supported by KBN grant 2 1087 91 01. ’ Supported by OTKA grant 2570;
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Shanghai Univ, Dept Math, Shanghai 200444, Peoples R ChinaShanghai Univ, Dept Math, Shanghai 200444, Peoples R China
Kang, Liying
Wang, Dingguo
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Chongqing Normal Univ, Coll Math Sci, Chongqing 400047, Peoples R ChinaShanghai Univ, Dept Math, Shanghai 200444, Peoples R China
Wang, Dingguo
Shan, Erfang
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