@Unpublished{weka368,
  author = {et. al., Frank Eibe},
  title  = {WEKA Manual for Version 3-6-0},

  year   = {2008},
  number = {},
  url    = {},

  const  = {\ text}
}
@Book{citeulike:340715,
  author = {Witten, Ian H. and Frank, Eibe},
  title  = {Data Mining: Practical Machine Learning Tools and Techniques},

  year   = {2005},
  number = {},
  url    = {http://www.amazon.fr/exec/obidos/ASIN/0120884070/citeulike04-21},

  const  = {\ text}
}