R
[Rah09] George Rahonis. Fuzzy Languages. In Manfred Droste, Werner Kuich, and Walter Vogler (eds.), Handbook of Weighted Automata. Springer-Verlag, 2009. 
@incollection{hwa-ch12-Rah,
  author =              {Rahonis, George},
  title =               {Fuzzy Languages},
  editor =              {Droste, Manfred and Kuich, Werner and Vogler,
                         Walter},
  booktitle =           {Handbook of Weighted Automata},
  publisher =           {Springer-Verlag},
  pages =               {481-517},
  chapter =             {12},
  year =                {2009},
  doi =                 {10.1007/978-3-642-01492-5 12},
}
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