Received:March 13, 1998  
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Author NameAffiliation
郭希娟 燕山大学数学系，河北秦皇岛 066004 
王永茂 燕山大学数学系，河北秦皇岛 066004 
刘德有 燕山大学数学系，河北秦皇岛 066004 
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Citation:
DOI:10.3770/j.issn:1000-341X.2001.01.014
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