南京师范大学数学系!南京,210097,南通师范专科学校数学系!南通,226007
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Yang Runsheng(Department of Mathematics, Nanjing Normal University, Nanjing 210097, P. R. China)(Email:Tshy@njnu. eds. cn)Shen Sulin(Department of Mathematics, Nantong Teachers College, Nantong 226007. P. R. China)
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