Hidetsugu Nanba Atsushi Fujii Makoto Iwayama Taiichi Hashimoto The patent mining task in the seventh NTCIR workshop. 25-32 2008 PaIR http://doi.acm.org/10.1145/1458572.1458580 conf/cikm/2008pair db/conf/cikm/pair2008.html#NanbaFIH08