Benjamin Arai Gautam Das Dimitrios Gunopulos Nick Koudas Anytime measures for top-<i>k</i> algorithms on exact and fuzzy data sets. 407-427 2009 18 VLDB J. 2 http://dx.doi.org/10.1007/s00778-008-0127-9 db/journals/vldb/vldb18.html#AraiDGK09