Antonio Toral Óscar Ferrández Elisa Noguera Zornitsa Kozareva Andrés Montoyo Rafael Muñoz GIR with Geographic Query Expansion. 889-892 2006 conf/clef/2006 CLEF http://dx.doi.org/10.1007/978-3-540-74999-8_112 db/conf/clef/clef2006.html#ToralFNKMM06