@Article{sets:meyer+hornik:2009,
  author       = {David Meyer and Kurt Hornik},
  title	       = {Generalized and Customizable Sets in \proglang{R}},
  journal      = {Journal of Statistical Software},
  year	       = 2009,
  volume       = 31,
  number       = 2,
  pages	       = {1--27},
  doi	       = {10.18637/jss.v031.i02},
}

@InCollection{sets:cantor:1895,
  author       = {Georg Cantor},
  title	       = {Beitr{\"a}ge zur Begr{\"u}ndung der transfiniten
                  Mengenlehre},
  booktitle    = {Mathematische Annalen},
  pages	       = {481--512},
  publisher    = {Springer-Verlag},
  year	       = 1895,
  volume       = 46
}

@InCollection{sets:zermelo:1908,
  author       = {Ernst Zermelo},
  title	       = {Untersuchungen {\"u}ber die Grundlagen der Mengenlehre},
  booktitle    = {Mathematische Annalen},
  publisher    = {Springer-Verlag},
  pages	       = {261--281},
  year	       = 1908,
  volume       = 65
}

@InCollection{sets:fraenkel:1922,
  author       = {Adolf Abraham Fraenkel},
  title	       = {{\"U}ber die Grundlagen der Cantor-Zermeloschen
                  Mengenlehre},
  booktitle    = {Mathematische Annalen},
  publisher    = {Springer-Verlag},
  pages	       = {230--237},
  year	       = 1922,
  volume       = 86
}

@Article{sets:zadeh:1965,
  author       = {Lofti A. Zadeh},
  title	       = {Fuzzy Sets},
  journal      = {Information and Control},
  year	       = 1965,
  volume       = 8,
  number       = 3,
  pages	       = {338--353}
}

@Article{sets:yager:1980,
  author       = {Ronald R. Yager},
  title	       = {On a General Class of Fuzzy Connectives},
  journal      = {Fuzzy Sets and Systems},
  year	       = 1980,
  volume       = 4,
  pages	       = {235--242},
}

@Article{sets:yager:1986,
  author       = {Ronald R. Yager},
  title	       = {On the Theory of Bags},
  journal      = {International Journal of General Systems},
  year	       = 1986,
  volume       = 13,
  pages	       = {23--37}
}

@Article{sets:singh+ibrahim+yohanna:2007,
  author       = {D. Singh and A.M. Ibrahim and T. Yohanna and
                  J.N. Singh},
  title	       = {An Overview of the Applications of Multisets},
  journal      = {Novi Sad Journal of Mathematics},
  year	       = 2007,
  volume       = 37,
  number       = 3,
  pages	       = {73--92}
}

@InCollection{sets:matthe+caluwe+tre:2006,
  author       = {Tom Matth{\'e} and Rita De Caluwe and Guy de Tr{\'e}
                  and Axel Hallez and J{\"o}rg Verstraete and Marc
                  Leman and Olmo Cornelis and Dirk Moelants and Jos
                  Gansemans},
  title	       = {Similarity Between Multi-valued Thesaurus
                  Attributes: Theory and Application in Multimedia
                  Systems},
  booktitle    = {Flexible Query Answering Systems},
  pages	       = {331-342},
  publisher    = {Springer-Verlag},
  year	       = 2006,
  series       = {Lecture Notes in Computer Science}
}

@Book{sets:knuth:1973,
  author       = {Donlald E. Knuth},
  title	       = {The Art of Computer Programming},
  publisher    = {Addison-Wesley},
  year	       = 1973,
  address      = {Reading},
  volume       = 3
}

@Article{sets:weber:1983,
  author       = {Siegfried Weber},
  title	       = {A General Concept of Fuzzy Connectives, Negations and
                  Implications Based on t-Norms and t-Conorms},
  journal      = {Fuzzy Sets and Systems},
  year	       = 1983,
  volume       = 11,
  pages	       = {115--134},
}


@Book{sets:wirth:1983,
  author       = {Niklaus Wirth},
  title	       = {Algorithmen und Datenstrukturen},
  publisher    = {Teubner},
  year	       = 1983,
  address      = {Stuttgart}
}

@Manual{sets:meyer+hornik:2008,
  title 	= {\pkg{sets}: Sets, Generalized Sets, and Customizable Sets},
  author 	= {David Meyer and Kurt Hornik},
  year 		= {2009},
  note 		= {\proglang{R}~package version~1.0},
  url           = {https://CRAN.R-project.org/package=sets}
}

@Manual{sets:meyer+buchta:2008,
  title 	= {\pkg{proxy}: Distance and Similarity Measures},
  author 	= {David Meyer and Christian Buchta},
  year 		= {2009},
  note 		= {\proglang{R}~package version~0.4-3},
  url           = {https://CRAN.R-project.org/package=proxy}
}

@Book{sets:klement+mesiar+pap:2000,
  author       = {Erich Peter Klement and Radko Mesiar and Endre Pap},
  title	       = {Triangular Norms},
  publisher    = {Springer-Verlag},
  address      = {Dordrecht},
  year	       = 2000
}

@Book{sets:dubois+prade+yager:1996,
  editor       = {Didier Dubois and Henri Prade and Ronald Y. Yager},
  title	       = {Fuzzy Information Engineering: A Guided Tour of
                  Applications},
  address      = {New York},
  publisher    = {John Wiley \& Sons},
  year	       = 1996
}

@Manual{sets:roberts:2007,
  title	       = {\pkg{fso}: Fuzzy Set Ordination},
  author       = {David W. Roberts},
  year	       = 2007,
  note	       = {\proglang{R}~package version~1.0-1},
  url          = {https://CRAN.R-project.org/package=fso}
}

@Manual{sets:geyer:2007,
  title	       = {\pkg{fuzzyRankTests}: Fuzzy Rank Tests and Confidence
                  Intervals},
  author       = {Charles J. Geyer},
  year	       = 2007,
  note	       = {\proglang{R}~package version~0.3-2},
  url          = {https://CRAN.R-project.org/package=fuzzyRankTests}
}

@Manual{sets:vinterbo:2007,
  title	       = {\pkg{gcl}: Compute a Fuzzy Rules or Tree Classifier from
                  Data},
  author       = {Staal A. Vinterbo},
  year	       = 2007,
  note	       = {\proglang{R}~package version~1.06.5},
  url          = {https://CRAN.R-project.org/package=gcl}
}

@Manual{sets:lewin:2007,
  title	       = {\pkg{fuzzyFDR}: Exact Calculation of Fuzzy Decision Rules
                  for Multiple Testing},
  author       = {Alex Lewin},
  year	       = 2007,
  note	       = {\proglang{R}~package version~1.0},
  url          = {https://CRAN.R-project.org/package=fuzzyFDR}
}

@Manual{sets:alvarez:2007,
  title	       = {\pkg{FKBL}: Fuzzy Knowledge Base Learning},
  author       = {Alvaro Gonzalez Alvarez},
  year	       = 2007,
  note	       = {\proglang{R}~package version~0.50-4},
  url          = {https://CRAN.R-project.org/package=FKBL}
}

@Manual{sets:aklan+altindas+macit:2008,
  title	       = {\pkg{fuzzyOP}: Fuzzy Numbers and the Main Mathematical
                  Operations},
  author       = {Semagul Aklan and Emine Altindas and Rabiye Macit
                  and Senay Umar and Hatice Unal},
  year	       = 2008,
  note	       = {\proglang{R}~package version~1.0},
  url          = {https://CRAN.R-project.org/package=fuzzyOP}
}

@Article{sets:mizutani+inokuchi+miyamoto:2008,
  author       = {Kiyotaka Mizutani and Ryo Inokuchi and Sadaaki
                  Miyamoto},
  title	       = {Algorithms of Nonlinear Document Clustering Based on
                  Fuzzy Multiset Model},
  journal      = {International Journal of Intelligent Systems},
  year	       = 2008,
  volume       = 23,
  pages	       = {176--198}
}

