Avi Rosenfeld Claudia V. Goldman Gal A. Kaminka Sarit Kraus PHIRST: A distributed architecture for P2P information retrieval. 290-303 2009 34 Inf. Syst. 2 http://dx.doi.org/10.1016/j.is.2008.08.002 db/journals/is/is34.html#RosenfeldGKK09