@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} }