Ricoh at CLEF 2003. - Yuichi Kojima; Hideo Itoh; Hiroko Mano; Yasushi Ogawa (CLEF, 2003)

Ricoh at CLEF 2004. - Yuichi Kojima (CLEF (Working Notes), 2004)

Ricoh in the NTCIR4 CLIR Tasks. - Yuichi Kojima; Hideo Itoh (NTCIR, 2004)