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/usr/lib/R/site-library/coin/CITATION is in r-cran-coin 1.2-1-1ubuntu1.

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The actual contents of the file can be viewed below.

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citHeader("To cite coin in publications use:")

citEntry(entry="Article",
  title        = "A Lego System for Conditional Inference",
  author       = personList(as.person("Torsten Hothorn"),
                            as.person("Kurt Hornik"),
                            as.person("Mark A. van de Wiel"),
                            as.person("Achim Zeileis")),
  journal      = "The American Statistician",
  year         = "2006",
  volume       = "60",
  number       = "3",
  pages        = "257--263",

  textVersion  =
  paste("Torsten Hothorn, Kurt Hornik, Mark A. van de Wiel and Achim Zeileis (2006).",
        "A Lego System for Conditional Inference.",
        "The American Statistician 60(3), 257-263."),

  header = "The main reference for the framework implemented in coin is:"
)

citEntry(entry = "Article",
  title        = "Implementing a Class of Permutation Tests: The {coin} Package",
  author       = personList(as.person("Torsten Hothorn"),
                            as.person("Kurt Hornik"),
                            as.person("Mark A. van de Wiel"),
                            as.person("Achim Zeileis")),
  journal      = "Journal of Statistical Software",
  year         = "2008",
  volume       = "28",
  number       = "8",
  pages        = "1--23",
  url          = "http://www.jstatsoft.org/v28/i08/",

  textVersion  =
  paste("Torsten Hothorn, Kurt Hornik, Mark A. van de Wiel, Achim Zeileis (2008).",
        "Implementing a Class of Permutation Tests:  The coin Package.",
        "Journal of Statistical Software 28(8), 1-23.",
        "URL http://www.jstatsoft.org/v28/i08/."),

  header = "The reference for the implementation approach in coin is:"
)