作者单位：
Department of Mathematics, FIN-20014 University of Turku, Finland
[1]
Department of Biochemistry and Pharmacy, Abo Akademi University P. O. Box 66, FIN-20521 Abo, Finland
[2]
Rolf Nevanlinna Institute, Department of Mathematics and Statistics P.O. Box 68, FIN-00014 University of Helsinki, Finland
[3]
Department of Mathematics, Linkoping University S-581 83 Linkoping, Sweden
[4]
发布时间
2013-11-20
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