The Commutative Ring of a Symmetric Design is Not Associative when λ≠1
Received:July 21, 1997  
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YIN Dong-sheng Inst. of Math. Sci .
Dalian Univ. of Tech .
Dalian 116024 
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DOI:10.3770/j.issn:1000-341X.1999.03.003
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