Makoto Iwayama Atsushi Fujii Noriko Kando Akihiko Takano Report on the patent retrieval task at NTCIR workshop 3. 22-24 2004 38 SIGIR Forum 1 http://doi.acm.org/10.1145/986278.986282 db/journals/sigir/sigir38.html#IwayamaFKT04