Received:January 12, 1991  Revised:November 17, 1992
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Author NameAffiliation
王德全 新疆大学数学系, 乌鲁木齐 
黄永年 新疆大学数学系, 乌鲁木齐 
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DOI:10.3770/j.issn:1000-341X.1993.02.009
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