V. Kryssanov, M. Okabe, K. Kakusho, and M. Minoh. Engineering Information Systems in the Internet Context, volume 231 of IFIP Conference Proceedings, page 333-356. Kluwer, (2002)
M. Okabe, K. Umemura, and S. Yamada. HLT '05: Proceedings of the conference on Human Language Technology and Empirical Methods in Natural Language Processing, page 963--970. Morristown, NJ, USA, Association for Computational Linguistics, (2005)