%Aigaion2 BibTeX export from Bibliography Database of the Working Group on Computational Intelligence
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@INBOOK{Kruse1989,
     author = {Kruse, Rudolf and Meyer, K. D.},
     editor = {Janko, W. H. and Roubens, M. and Zimmermann, Hans-J{\"{u}}rgen},
      title = {On Calculating the Covariance in the Presence of Vague Data},
     series = {Progress in Fuzzy Sets and Systems},
       year = {1989},
  publisher = {Kluwer},
    address = {Amsterdam, Netherlands}
}