PIMOS: A Concurrent Logic Programming Environment. - Ryozo Kiyohara; Koichi Nakao; Kumiko Wada; Takashi Chikayama (LPE, 1990)

Single Language Information Retrieval at NTCIR-5. - Qing Ma; Koichi Nakao; Kousuke Enomoto; Masaki Murata (NTCIR, 2005)

Selection of Japanese-English Equivalents by Integrating High-quality Corpora and Huge Amounts of Web Data. - Qing Ma; Koichi Nakao; Masaki Murata; Hitoshi Isahara (LREC, 2008)