@patent{HeiPlaSimSch09, title = {Acquiring web page information without commitment to downloading the web page}, author = {Heilbron, L. and Platt, J. C. and Simard, P. Y. and Sch{\"o}lkopf, B.}, howpublished = {United States Patent, No 7565409}, month = jul, year = {2009}, note = {(expired)}, doi = {}, month_numeric = {7} }