Marcel Karnstedt Kai-Uwe Sattler Michael Haß Manfred Hauswirth Brahmananda Sapkota Roman Schmidt Approximating query completeness by predicting the number of answers in DHT-based web applications. 71-78 2008 WIDM http://doi.acm.org/10.1145/1458502.1458514 conf/widm/2008 db/conf/widm/widm2008.html#KarnstedtSHHSS08