Virtual System Method
Received:September 25, 1991  
Key Words:   
Fund Project:Research supported by the National Natural Science Foundation of China and the Doctoral programm Foundation of Institution of Higher Education.
Author NameAffiliation
Zheng Zhongguo Dept. of Math.
Peking University
Beijing
100871 
Jin Hua Dept. of Math.
Peking University
Beijing
100871 
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Abstract:
      
Citation:
DOI:10.3770/j.issn:1000-341X.1993.02.003
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