@Book{manning2008,
  author = {Manning, C. D. and Raghavan, P. and Schütze, H.},
  title  = {Introduction to Information Retrieval},

  year   = {2008},
  number = {},
  url    = {http://www-csli.stanford.edu/~hinrich/information-retrieval-book.html},

  const  = {\ text}
}