From: ted.dunning@gmail.com   
      
   The distinction is much older than that, although I don't have a   
   reference.  I know that the fuzzy logic community has used the term   
   fuzzy clustering forever as well.   
      
   My first knowledge of this was in the context of Gaussian mixture   
   clustering about 15 years ago.   
      
   I wonder if the terms even need a reference any more.  They are   
   relatively self-explanatory.  At most a parenthetical sentence along   
   the lines of what Yaroslav said would be sufficient.  Certainly, I   
   would not give one of the many, many articles that have used the terms   
   credit for having invented it.   
      
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