Two-Stage Patent Retrieval Method Considering Claim Structure. - Hisao Mase; Tadataka Matsubayashi; Yuichi Ogawa; Makoto Iwayama; Tadaaki Oshio (NTCIR, 2004)

NTCIR-5 Patent Retrieval Experiments at Hitachi. - Hisao Mase; Tadataka Matsubayashi; Yuichi Ogawa; Takaaki Yayoi; Yusuke Sato; Makoto Iwayama (NTCIR, 2005)

Proposal of two-stage patent retrieval method considering the claim structure. - Hisao Mase; Tadataka Matsubayashi; Yuichi Ogawa; Makoto Iwayama; Tadaaki Oshio (ACM Trans. Asian Lang. Inf. Process., 2005)