Thomas Neumann Matthias Bender Sebastian Michel Ralf Schenkel Peter Triantafillou Gerhard Weikum Distributed top-<i>k</i> aggregation queries at large. 3-27 2009 26 Distributed and Parallel Databases 1 http://dx.doi.org/10.1007/s10619-009-7041-z db/journals/dpd/dpd26.html#NeumannBMSTW09