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%Aigaion2 BibTeX export from 
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@TECHREPORT{,
       author = {Fernández-Madrigal, Juan-Antonio},
        month = may,
        title = {The Categories of Graphs with Abstractions and Graphs with Refinements},
         year = {2005},
  institution = {System Engineering and Automation Dpt. - Univesity of MÃ¡laga (Spain)}
}