Guido Zuccon Leif Azzopardi Dell Zhang Jun Wang 0012 Top-k Retrieval Using Facility Location Analysis. 305-316 2012 ECIR http://dx.doi.org/10.1007/978-3-642-28997-2_26 conf/ecir/2012 db/conf/ecir/ecir2012.html#ZucconAZW12