Reza Akbarinia Esther Pacitti Patrick Valduriez Reducing network traffic in unstructured P2P systems using Top-<i>k</i> queries. 67-86 2006 19 Distributed and Parallel Databases 2-3 http://dx.doi.org/10.1007/s10619-006-8313-5 db/journals/dpd/dpd19.html#AkbariniaPV06