@book{melucci2011advanced,
  title={Advanced Topics in Information Retrieval},
  author={Melucci, M. and Baeza-Yates, R.},
  isbn={9783642209451},
  lccn={2011930729},
  series={The Information Retrieval Series},
  url={http://books.google.it/books?id=yFD0YjXoiiYC},
  year={2011},
  publisher={Springer}
}