Thomas Neumann Matthias Bender Sebastian Michel Ralf Schenkel Peter Triantafillou Gerhard Weikum Optimizing Distributed Top-k Queries. 337-349 2008 WISE http://dx.doi.org/10.1007/978-3-540-85481-4_26 conf/wise/2008 db/conf/wise/wise2008.html#NeumannBMSTW08